题目

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 答案： 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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