2. 外语
  3. Mr. Mitchell had to______his car alarm after it accidentally went off, to avoid disturbing his neighbors.

Mr. Mitchell had to______his car alarm after it accidentally went off, to avoid disturbing his neighbors.

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问题 Mr. Mitchell had to______his car alarm after it accidentally went off, to avoid disturbing his neighbors.
选项 A、silent
B、silence
C、silently
D、silenced
答案B
解析 与助动词有相似用法的had to之后应该接动词原形，所以动词原形(B)silence(使安静)是正确答案。形容词(A)，副词(C)和过去分词(D)都不能接在to后。作为参考，应该知道与助动词有相似用法的搭配还有had better(最好……)，would like to(想要)，used to(过去常常)等。
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