This machine needsonce a year in order to work properly. [ ]A. to check B. checking C. check D. checked -初中英语-n多题

◎ 题干

This machine needs ______ once a year in order to work properly.

[ ]

A. to check
B. checking
C. check
D. checked

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◎ 解析

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◎ 知识点

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