A survey of the opinions of experts ________ that three hours of outdoor exercise a week ________ good for one’s health.
A．show; areB．shows; isC．show; isD．shows; are
B
考查主謂一致。A survey of the opinions of experts中中心詞是survey調(diào)查，抽象名詞，不可數(shù)，故謂語動詞用單數(shù)。下文，主語是three hours of outdoor exercise，中心詞是outdoor exercise，抽象名詞，不可數(shù)，故謂語動詞用單數(shù)。選B。
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