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【题目】A survey of the opinions of experts that three hours of outdoor exercise a week good for one’s health.

A. show; are

B. shows; is

C. show; is

D. shows; are

【答案】B

【解析】a survey可知第一个空用shows, 首先排除AC两项;第二个空前的时间three hours of outdoor exercise a week表示抽象概念, 看作单数, 故其谓语动词用单数形式。

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