The experiment shows that proper amounts of exercise.if regularly.can improve our health．( )A．being carried outB．carrying outC．carried outD．to carry out 题目和参考答案——青夏教育精英家教网——

题目内容

5．The experiment shows that proper amounts of exercise，if __ regularly，can improve our health．（　　）

	A．	being carried out		B．	carrying out
	C．	carried out		D．	to carry out

分析句意：实验表明定期适量的体育运动能改善我们的健康状况．

解答答案C 分析题干可知，此句是if引导的条件状语从句的省略，补充完整为：if the exercise is carried out regularly，所以exercise与carry out 之间构成被动关系，故用过去分词作状语．而A项是进行时态的被动语态；B项是现在分词，表示主动；D项是不定式，表示主动和将来的动作．都与题干不符．所以选择C项．

点评考查过去分词做状语．主要看句子的主语与分词之间是主动还是被动关系．主动关系用现在分词；被动关系用过去分词．

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