单项选择题

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

A． whatB. involvesC. maybeD. for diagnosing
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单项选择题
What can we do for them ______ all the help they have given us
A．in regard to
B．in return for
C．in honour of
D．in reply to
单项选择题
She considered that Mr. Smith had taken ______ of his position.
A．profit
B．benefit
C．interested
D．advantage
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