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
The young man assured the boss that he would ______ all his energies to do the job well.
A．call on
B．call forth
C．call at
D．call off
单项选择题
I prefer ______ .
A．to read rather than watch TV
B．to read rather than watching TV
C．reading rather than watch TV
D．reading rather than to watch TV
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