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英语语法,关于主谓一致,下面三题不是很明白,请些点原因……谢谢

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英语语法,关于主谓一致,下面三题不是很明白,请些点原因……谢谢
for many young people,the last 1960s-----a perid of revolt against the moral values that had been the strength and pride to support the claims.
A.has been B.have been C.was there D.were
the weeks of summer training------for sport writes as it is for football players and coachs.
A.are often as tense B.is often as tense
C.are as often tense D.is tense as often
on two occasions she was accused of stealing money from the company,but in neither case -----any evidence to support the claims.
A.were there B.there were C.was there D.there was
is often as tense 什么意思还有第一题C.是was 写错了 你分析的很好谢谢
1,A .首先确定句子主语the last 1960s ,因谓语部分有a period of revolt可确定主语是被看做一个整体,因此根据主谓一致原则谓语动词要用单数B,D明显错误.C选项把there去掉也是对的.所以A正确.
2,B.主语the weeks of summer training ,根据谓语部分情况来看主语的数量概念被看做一个整体,谓语动词用单数.排除A,C often应位于be动词后选B
3,C.首先这是一个由but连接的并列句,所以直接看but后面的分句.in neither case ,表“每一种情况下都不“表示了一种单数概念因此可判断主语是单数,谓语动词也是单数.又因为介词词组放句首句子要倒装所以选was there.