题目内容
Climbing hills__________of great help to health.?
A.is B.are C.were D.be
A?
解析:
非谓语动词短语作主语时,谓语动词常用单数形式。?
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题目内容
Climbing hills__________of great help to health.?
A.is B.are C.were D.be
A?
非谓语动词短语作主语时,谓语动词常用单数形式。?