单项选择题

It is difficult to distinguish one twin （）the other.

A. to
B. by
C. for
D. from

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

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