(   ) 3.______ students in our class can surf the Internet often. Some of them have no computers.

A.  Both

B.   All

C. Not all

D. None of

3. C根據(jù)句意可知有些學(xué)生沒有電腦。not all 意為"并不是所有的"，表示部分否定。故選C

題目來源：仁愛英語同步練習(xí)簿九年級上下冊 > Topic 1 Pollution has caused too many problems.

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