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單項(xiàng)選擇題

You（）buy some reference books when you go to college.

A.could
B.will have to
C.must to
D.might

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The atmosphere（）certain gases mixed together in definite proportions.

A.composes of
B.is made up
C.consists of
D.makesup of

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Neither John（）his father was able to wake up early enough to catch the morning train.

A.nor
B.or
C.but
D.and