单项选择题

I can't wait （）Jack calls

A. until
B. when
C. as
D. since

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单项选择题

Denise will get better （）she takes this medicine

A. and
B. once
C. though
D. since

单项选择题

Helen's computer skills were poor, （）she didn't get the job

A. but
B. since
C. so
D. while

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