单项选择题

If the experiment succeeds or fails, it will provide us with valuable experience, which is essential to improving our future work.

A．If
B．provide us with
C．experience
D．improving
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单项选择题
If you read the book a second time, and you will probably have quite a different understanding of the events described in it.
A．a second time
B．and you
C．quite a different
D．described
单项选择题
In his latest article, the reporter criticized the way which the racial problem was being handled.
A．In
B．latest
C．which
D．being handled
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