单项选择题

Do it now,（）it will be too late.

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

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单项选择题
such a good chance, he planned to learn more.（）

A. To be given
B. Having been given
C. Having given
D. Giving
单项选择题
The work they are doing is（）great value.

A. in
B. of
C. by
D. from
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