13.By the end of last week,they D the bridge.

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13.By the end of last week,they __D__ the bridge.
A.has completed B.completed C.will complete D.had completed
14.Ben hates playing __B___ violin,but he likes playing ____ football.
A.a…the B.the… the C./ …the D.the…/
15.By the time he was 4,he __B____ a lot of German words.
A.had learned B.has learned C.learned D.learns
16 .Jim turned off the lights and then ___B__ the classroom.
A.was left B.had left C.has left D.left
17.They _____C____ in Guangzhou since 2000.
A.lived B.had lived C.have lived D.were living
18.The train from Beijing____D___ ten minutes ago.
A.has arrived B.was arriving C.arrived D.had arrived
19.The students _____B____ their classroom when the visitors arrived.
A .have cleaned B.had cleaned C.was cleaned D.have been cleaned
20.Fergie____D___ the project in one hour.
A.have finished B.will finish C.finishes D.has finished
21.The man _____B___ his coat and went out.
A.put on B.had put on C.will put on D.was putting on
22 My mother___A___ in that factory at the age of 18.
A.had worked B.has worked C.worked D.works
23.Dad ____D____ while he _______ TV.
A .fell asleep…watch B.was falling asleep…watched
C.fell asleep……was watching D.had fallen asleep…watched

13.正确.by the end of last week中用的是last week,所以要用过去完成时.
14.错误.选D.西方乐器要在play后加the.足球篮球等体育运动,在play后不加the.
15.错误.选A.解析类似于13题.其时间状语是过去的时态.by后加时间状语,要用完成时,完成是过去完成是还是现在完成时需要看时间.
16.错误.选D.正常的叙述的陈述语句,符合语意的时态是一般过去时.
17.正确.since 2000是时间状语,表示从2000年开始,用现在完成时.
18.错误.选C.时间状语是ten minutes ago,过去的时间,所以要用一般过去式,D选项是过去完成时,用在过去的过去,此处没用过去的过去.
19.正确.clean是在arrive之前的动作,所以用过去完成时.
20.错误.选B.in +时间做时间状语,表示一般过去的时间状态.
21.错误.选A.put on和went out用and连接,表示并列的动作,所以时态一样.
22.错误.选C.时间状语是at the age of 18,表示过去的时间,所以用一般过去式.
23.错误.选C.while引导的从句一般会用进行时,整句的时态是过去时,fell asleep表示睡着,一次性的动作,而watch TV是一直的动作.
ps:楼主.您错的有点多的啊.
那个.意见仅供参考.

13.By the end of last week,they __D__ the bridge. by the end of last month ,they___(build)five bridge by the end of last week用什么语态 by the end of last 10.The new suspension bridge _________ by the end of last mo They finish the bridge next year（用 by the end of next year改写 By the end of last week, she______in the west of China for t Last week, he told me that by the end of the next term, he _ TESTNINE 17.by the end of next month,the bridge By the end of last week, Mr Fang ____ (sell)thousands of car By the end of last week 611 people from 49 countries( )to at nobody had come here by the end of last week改反义疑问句