单项选择题

The reason for his success is () he worked hard.

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

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单项选择题
No progress was made in the trade talk as neither side would accept the conditions of ()

A. others
B. the other
C. either
D. another
单项选择题
The client didn't make()clear when and where the meeting would be held.

A. this
B. that
C. it
D. these
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