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

A. realize
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C. accept
D. recognize
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It is difficult to distinguish one twin ______ the other.()

A. to
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C. for
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