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

試題分析：句意：那個(gè)機(jī)器人每個(gè)月需要被檢查一次。而且我們將為你免費(fèi)檢查它。need doing="need" to be done需要被……。故選A。
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