This machine is very easy. Anybody can learn to use it in a few minutes. A. operatingB. to

发布时间：2020-08-17 04:41:04

This machine is very easy     . Anybody can learn to use it in a few minutes.
A. operating
B. to be operating
C. operated
D. to operate

网友回答

A. operating
B. to be operating
C. operated
(答案→)D. to operate
解析：表示将来，故用不定式。
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