单项选择题

As the manager was away on a business trip, I was asked to ______ the weekly staff meeting.

A. preside
B. introduce
C. chair
D. dominate
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Ultrasonic sounds produce pulsed signal______the location of submarine can be detected.
A. for which
B. of which
C. as a result of which
D. by means of which
单项选择题
He's always ready to take ______ heavy responsibilities.
A. on
B. to
C. in
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