【題目】—How often does your sister exercise? —About________ (two) a week.

【答案】twice

【解析】

句意：——你姐姐多久鍛煉一次？ ——大約一周兩次。

根據(jù)問題中的“how often：多久”可知，此處問的是頻率，次數(shù)，所以本題的答句中應(yīng)該填twice，twice a week：一周兩次。故填twice。

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