Asurveyoftheopinionsofexperts      thatthreehoursofout...

问题详情：

 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

【回答】

B  

知识点：一般现在时及其被动式

题型：选择题