题目内容

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
这题考查主谓一致，第一空的主语是：A survey of the opinions of experts，中心词是a survey，谓语是单数，第二空的主语是three hours of outdoor exercise，中心词是outdoor exercise，所以谓语是单数。选B。
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