单项选择题

Truthfulness and honesty ______ always the best policy.

A. are
B. is

C. have been
D. be
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单项选择题
Nancy is so poor that even fifty dollars ______ a big sum to her.
A. is
B. are

C. add

D. equal
单项选择题
It was president of the union ______ the students elected him.
A. who
B. whom

C. which

D. what
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