“______ do you exercise?” Three times a week.”

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

B 

解析試題分析：How long“多長(zhǎng)時(shí)間”， How far“多遠(yuǎn)”，How many“多少”，How often詢(xún)問(wèn)頻率，表示“多久一次”。 根據(jù)下文，一周三次�？芍衔奶釂�(wèn)的是多久一次（頻率），故選B，你多久鍛煉一次？
考點(diǎn)：考查疑問(wèn)詞辨析。

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