单项选择题

It was （）he worked hard that he succeeded.

A. because
B. for
C. as
D. since

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单项选择题

The reason （）he didn’t come was （）he was ill.

A. why; that
B. that; why
C. for that; that
D. for which; what

单项选择题

Try your best, （）you’ll certainly succeed this time.

A. so
B. and
C. or
D. for

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