A recent survey of problems on health______that outdoor exercise______of great i

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问题 A recent survey of problems on health______that outdoor exercise______of great importance to people’s health.

选项 A、have shown; are
B、are shown; are
C、has shown; is
D、is shown; is

答案 C

解析 关于健康问题的一项最新调查显示,户外锻炼对保持健康很重要。句子的主语是survey且是主动语态,所以选项C正确。
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