单项选择题

______ the instruction carefully, the mistakes can be avoided.

A. Having checked


B. Check
C. If you check



D. To check
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As she joined the company before me, she is senior （）me.

A. from
B. to
C. than
D. for
单项选择题
He made another wonderful discovery, ______ of great importance to science.
A. which I think is



B. which I think it is
C. which I think it


D. I think which is
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