单项选择题

Have you （）had a part-time job

A. ever
B. since
C. before
D. ago

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单项选择题

Jack （）so strong. He can lift the heavy boxes

A. was
B. is
C. be
D. will be

单项选择题

Good Food Co. （）successful since 1982.

A. was
B. has been
C. will be
D. is

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