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The teacher __________ have thought Johnson was worth it or she wouldn’t have wasted time on him, I suppose.

A. should       B. can

C. would D. must

D。


解析:

“must+have+过去分词”表示对过去情况的肯定推测。句意为:我想,老师一定认为约翰逊是值得教的,要不然她就不会在他身上浪费时间了。

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