This robot is supposed to save a lot of labor, but it remains a problem if it ______. A．is B．saves C...
2023-01-04 18:12:01 203次 英语语法练习题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
This robot is supposed to save a lot of
labor, but it remains a problem if it ______.
|
A．is
|
B．saves
|
C．does
|
D．has
|
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