【題目】— should teenagers spend at least 30 minutes taking exercise?

—Five times a week，according to some reports．

A．How much B．How soon

C．How long D．How often

【答案】D

【解析】

試題分析：句意：--青少年多長時間做一次不低于30分鐘的鍛煉？ --據(jù)一些報告說，一周五次。How much提問不可數(shù)的量；How soon多快；How long 多長時間；How often多久一次。故選。D。

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