单项选择题

It () John and Kate who helped me the other day.

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

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单项选择题

Tom looks so pale today. He ()ill.

A. must be
B. had to be
C. should be
D. shall be

单项选择题

Forty percent()stopped smoking in that company.

A. has
B. is
C. have
D. are

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