单项选择题

Our research has 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
You can arrive in Beijing earlier for the meeting ______ you don't mind taking the night train.
A．provided
B．unless
C．though
D．until
单项选择题
This watch is ______ to all the other watches on the market.
A．superior
B．advantageous
C．super
D．beneficial
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