by 1980 the bridge ________

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/10/03 02:17:56

by 1980 the bridge ________
A.was completed
B.had been completed
C.has been completed
D.have been completed
by+时间点用什么时态
+时间段用什么时态

我认为,by后一般加时间点,表示“不迟于某时”,如I will finish the work by Friday.(最迟星期五我会完成工作）,而它很少加某个时间段（不代表无,至少我没碰见）,也不因后面是加时间点还是时间段来决定时态,它是这样的：如果by后加将来的时间（如上面一句）,则与将来时或将来完成时连用；若后跟过去的时间（如你问的问题）,则与过去完成时连用.所以答案选B.
再告诉你一点,它与before不同,by表示“不迟于某时”,包括“某时”,before表示“在某时之前”,不包括“某时”

when ___ the bridge ________? TESTNINE 17.by the end of next month,the bridge by the end of last month ,they___(build)five bridge The Verrazano Bridge,which was designed by Othmar Ammann,joi The bridge _________2,000 meters long was designed by Frank. The village students have to cross the bridge ________ the r --please return the books by Friday.--________. 为什么by car/bus不加冠词,但是by the bridge要加冠词? The place ________ the bridge is supposed to be built should The new bridge is ________ the one built last year. A．three 求教英语选择题答案第1题 (1) 分 The bridge club ________ his application the bridge destroyed by flood was build 10 years ago the flo