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
This watch is ______ to all the other watches on the market.
A. superior
B. advantageous
C. super
D. beneficial
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
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