A.mustn’t
B.hadn’t
C.didn’t
D.hasn’t
解析:主句的时间状语by the end of last month是过去完成时的时间状语,因此B项符合。
答案:B
14.—I telephoned him twice but I couldn’t get through to his home.
—I think that the line might have been out of order,______?
A.doesn’t it
B.wasn’t it
C.don’t you
D.hadn’t it
解析:考查“情态动词+have done”结构的反义疑问句,对话中暗含着动作发生在过去,因此,附加疑问部分的助动词应用was。
答案:B
15.The research is so designed that once ______ nothing can be done to change it.
A.begins
B.having begun
C.beginning
D.begun
解析:once begun是once引导的条件状语从句的省略形式,=Once it is begun.。句意:这个研究一旦开始什么都不能使它改变。
答案:D
二、完形填空
Last week,it was a delightful surprise to meet my old school teacher.I call her my old school teacher as if she were the__1__one who taught me in school.There were many others too.But the truth is that she is the only one that has stayed in my__2__so long,and she is the very one that’s been worth keeping.
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