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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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