【題目】-________hours do they exercise every week?

-About 40 hours,I think.

A. How many B. How long C. How often D. How

【答案】A

【解析】試題分析：句意：——他們每周鍛煉多少小時(shí)？——我認(rèn)為大約40小時(shí)。Hours是可數(shù)名詞復(fù)數(shù)，只能用how many修飾。故選A。

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