—       do you go to the library?
—Once a week.
A. How many    B. How often   C.  How long
B

試題分析：句意為：你多久去一次圖書館？---每周一次。How long多長(zhǎng)，How many多少，How often多久一次。根據(jù)句意可知應(yīng)選B。
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