单项选择题

Mathematics ()the study or science of numbers.

A. is
B. are
C. was
D. were

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单项选择题
He was employed as an interpreter because he was () in three languages.

A. intimate
B. proficient
C. efficient
D. sufficient
单项选择题
() , this book will sell like not cakes.

A. Once printed
B. Printed
C. Having printed once
D. After to print
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