单项选择题

The speaker went on and on, ______ to his listeners' obvious boredom.

A．obligated
B．obsessive
C．obvious
D．oblivious
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单项选择题
Cough syrups and cold remedies that are manufactured with alcohol will last much longer than those prepared with water.
A．float
B．finish
C．remain effective
D．be prescribed
单项选择题
______ this coming Thursday, it will be too late to enroll of the course.
A．As of
B．As for
C．As to
D．As on
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