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Jack ____ yet, otherwise he would have telephoned me.

A.mustn't have arrived

B.shouldn't have arrived

C.can't have arrived

D.need not have arrived (本題選C)

2.當試題的前后句在動作和意義上構(gòu)成轉(zhuǎn)折關(guān)系時，常借助“but, however, instead”等詞來表示過去的動作與客觀事實不符，這時我們就可以用“對立”關(guān)系來解決這樣的試題。這種結(jié)構(gòu)常見的有：

should have done / ought to have done：表示過去本應(yīng)該做某事而實際上沒有做。

should not have done / ought not to have done：表示過去本不應(yīng)該做某事但事實上卻做了。

need have done：表示過去本來有必要去做某事，但事實上沒有做。

need not have done：表示過去本來沒有必要做某事，但事實上卻做了。如：

3) I was really anxious about you. You _____ home without a word.

A.mustn't leave

B.shouldn't have left

C.couldn't have left

D.needn't leave

分析該題前后句之間的關(guān)系和語氣可知，事實上是 “本不應(yīng)該離家出走卻走了”，故本題選B。

4) I told Sally how to get here, but perhaps I _____ for her.

A.had to write it out

B.must have written it out

C.should have written it out

D.ought to write it out

由句中的連詞but可知前后句之間是對立關(guān)系，分析題意可知本題應(yīng)選C。

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