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几道英语单选题,很迷惑!

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几道英语单选题,很迷惑!
1.My new dictionary is missing.Who _________ have taken it?
A.should B.must C.would D.could
为什么不选C
2I wonder if it was _________ I failed to answer her e-mail in time that made her angry with me.
A.why B.that C.when D.because
3 -What can I do to join in the league?-_______ weight.
A.As she put on B.Put on C.Putting on D.Because of putting on选B,为什么不能选C
几道英语单选题,很迷惑!
1.否定句和疑问句中只能用can(can't)or could(coludn't)!
2.这不是强调句.首先来看从句(I failed to answer her e-mail in time that made her angry with me.)从句结构完整,主谓宾应有尽有,什么成分都不缺,所以引导词也不能作成分,A选项和D选项都作原因状语,C项作时间状语,只有D项不作成份.
3.第一眼看到这题目,首先就能排除AD选项,在BC之间选,如果选C,Putting是非谓语动词,Putting on weight整个句子就缺少主语,所以不能选C,这类考题考生极易上当,选B的话整个就是个祈使句,主语You被省略了,所有只有B是正确答案.