单项选择题

Those were the graduate assistants ______ to do the research work in the lab.

A．to whom it was their responsibility
B．whose responsibility there was
C．whose responsibility was
D．of whom with the responsibility
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单项选择题
We know our friends by their defects ______ by their merits.
A．than
B．in the place of
C．rather than
D．instead of
单项选择题
It was dark in the cave so she ______ a match.
A．struck
B．hit
C．fired
D．burned
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