单项选择题

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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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
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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