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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 (本题选C)
2.当试题的前后句在动作和意义上构成转折关系时，常借助“but, however, instead”等词来表示过去的动作与客观事实不符，这时我们就可以用“对立”关系来解决这样的试题。这种结构常见的有：
should have done / ought to have done：表示过去本应该做某事而实际上没有做。
should not have done / ought not to have done：表示过去本不应该做某事但事实上却做了。
need have done：表示过去本来有必要去做某事，但事实上没有做。
need not have done：表示过去本来没有必要做某事，但事实上却做了。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
分析该题前后句之间的关系和语气可知，事实上是 “本不应该离家出走却走了”，故本题选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
由句中的连词but可知前后句之间是对立关系，分析题意可知本题应选C。
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