—I forgot to return the book to you yesterday. So I______today.A. might do it B.

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问题 —I forgot to return the book to you yesterday. So I______today.

选项 A. might do it
B. must do it
C. had to do it
D. must have to do it

答案B

解析我昨天忘了把这本书还你了。所以我今天必须这样做。
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