This machine needs once a year in order to work properly. A. to check B. checking C. check D.——青夏教育精英家教网——

题目内容

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

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

试题答案

B

相关题目

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

[ ]

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

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