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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The poor man, (having been) brutally (beated by) the police, (cried) out (in) pains.
A．having been
B．beated by
C．cried
D．in
单项选择题
The (athlete), together (with) (his coach) and several relatives, (are) traveling to the Olympic Games.
A．athlete
B．with
C．his coach
D．are
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