单项选择题

It was (him) who did all the work (on) the invention, but somebody (else) got (all the credit).

A. him
B. on
C. else
D. all the credit
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I do not know where (could he have) (gone) (so early) (in the) morning.
A. could he have
B. gone
C. so early
D. in the
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A bone marrow test, (what) (involves) extracting fluid from the marrow, (maybe) necessary (for diagnosing) leukemi()

A. what
B. involves
C. maybe
D. for diagnosing
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