单项选择题

The scientific group is carrying out a research focused on a drug which is so _______ as to be able to change brain chemistry.

A．powerful
B．influential
C．monstrous
D．vigorous
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单项选择题
How did James Bond escape from the locked confine Oh, you know he always manages _______ a tight situation.
A．to get out of
B．getting out of
C．to have got him out of
D．in getting out of
单项选择题
It's quite late now and Mr. White _______ hasn't left his office.
A．still
B．already
C．since
D．yet
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