【題目】— _____ do they exercise?

— Twice a week.

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

【答案】B

【解析】

試題分析：句意：他們多久鍛煉一次身體？——一周兩次。A. How many 多少；B. How often 多久一次；C. How long多長(zhǎng)時(shí)間；D. When什么時(shí)候。根據(jù)答語(yǔ)可知，是詢問(wèn)頻率，故答案為B。

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