单项选择题

______, the guest speaker was ushered into the auditorium hall to give the lecture.

A．Being shown around the campus
B．Having shown to the campus
C．After been shown around the campus
D．Having been shown around the campus
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单项选择题
The effect of this medicine ______ by midnight, the doctor told Emma You had better not try to read tonight.
A．will wear off
B．wears off
C．will have worn off
D．will be worn off
单项选择题
He had no alternative but ______ to fight in the Middle East.
A．to go
B．go
C．going
D．went
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