单项选择题

The business of each day, ______ selling goods or shipping them, went quite smoothly.

A．it being
B．be it
C．was it
D．it was
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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
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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