问题
选择题
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
答案
答案：D
在句型“主语+be+adj+to do”中，如果这个主语是动词do的逻辑宾语，故用主动表被动，所以选D。
【考点】非谓语动词
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