---______do the students exercise a week ?
---Once or twice.
A．How oftenB．How longC．HowD．How many times
D

試題分析： A.多久一次  B.多長   C.怎樣   D.多少次。根據(jù)答語：一次或者兩次�？芍xD。
點評：英語中和how搭配構(gòu)成的疑問詞有很多，需牢記他們表達(dá)含義的不同，答題中結(jié)合上下文語境選擇合適答案。
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