A survey of the opinions of experts           that three hours of outdoor exercise a week is good for one’s health.
A. show                      B. shows                C. is shown

B

解析試題分析:句意:專家觀點(diǎn)的調(diào)查表明在戶外一周鍛煉三個小時對健康有好處。主語是第三人稱單數(shù),和謂語動詞之間事實(shí)主動關(guān)系,故選B。
考點(diǎn):考查動詞的第三人稱單數(shù)的用法。

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