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
Though I haven't seen him for years, I can ______ his voice on the telephone.()

A. realize
B. discover
C. accept
D. recognize
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