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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______this coming Thursday, it will be too late to enrol for the course.
A．As of
B．As for
C．As to
D．As on
单项选择题
The day was crisp and sharp, but suddenly a misty rain began to fall and ______ the landscape.
A．hid
B．blurred
C．relieved
D．belittled
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