单项选择题

We must ______ early in the morning so as to catch the first train.()

A. set up
B. set out
C. set about
D. set aside

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I think he studies very hard, ______.()

A. does he
B. doesn't he
C. don't I
D. do I
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It is a question ______ the book will be published this month or next month.()

A. if
B. whether
C. that
D. which
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