单项选择题

A bone marrow test, (what) (involves) extracting fluid from the marrow, (maybe) necessary (for diagnosing) leukemia.

A．what
B．involves
C．maybe
D．for diagnosing
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单项选择题
The poor man, (having been) brutally (beated) by the police, (cried) out (in) pains.
A．having been
B．beated
C．cried
D．in
单项选择题
Cathy (had) better (to change) her study habits if she (hopes to) be admitted (to a good university).
A．had
B．to change
C．hopes to
D．to a good university
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