单项选择题

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
单项选择题
It is essential that all these figures ______ twice.()

A. must be checked
B. be checked
C. is checked
D. will be checked
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