【題目】—______does your mother go shopping?

—Twice a week.

A. How longB. How oftenC. when

【答案】B

【解析】

句意:——你的母親多久去購一次物?——一周兩次。A. How long多久,提問for+一段時間;B. How often多久一次,提問頻度;C. when何時。根據(jù)下文Twice a week.可知這里是提問頻度。根據(jù)題意,故選B。

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