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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I want to use the same tools ______ used in your factory a few days ago.
A. as was
B. which was
C. as were
D. which
单项选择题
Writing stories and articles ______ I enjoy most.
A. is that
B. are that
C. is what
D. have been what
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