【題目】—_____ do you go online, Mary?
— Twice a week.
A.How long
B.How often
C.How many
D.How much

【答案】B
【解析】句意：—瑪麗，你多久上一次網(wǎng)？—一周兩次。此題考查特殊疑問詞，A多長時間；B多久一次；C多少；D多少錢。根據(jù)“一周兩次”可知問的是頻率，應(yīng)選B。

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