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【多选题】
下列民事行为无效的有( )。A.
精神病人在神智不清醒的状态下实施的民事行为
B.
无民事行为能力人实施的民事行为
C.
违反诚实信用原则的民事行为
D.
违背社会公德和社会公共利益的民事行为
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反馈参考答案：
举一反三
【单选题】Not only his parents but also his grandfather ________ to a lot of places of interest in our country since they came here.
A.
has gone
B.
has been
C.
have gone
D.
have been
【单选题】What did Andy do when his grandfather was sick?
A.
He took care of the farm.
B.
He read his grandfather stories.
C.
He told his grandfather the news.
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