题目内容

【题目】The robot needs ____________once a month. And we will check it for you for free.

A. to check B. be checked

C. checking D. check

【答案】C

【解析】

试题分析：句意：机器人需要一个月被检查一次。我们会为你免费检查的。此题考查动词短语need doing需要被做=need to be done。根据句意，应选C。

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