题目内容

The robot needs _______ once a month. And we will check it for you for free.
A．to checkB．checkedC．checkingD．to checking
A

试题分析：句意：那个机器人每个月需要被检查一次。而且我们将为你免费检查它。need doing="need" to be done需要被……。故选A。
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