单项选择题

There are, more than fifty proposals______ at the conference.

A．discussing
B．having been discussed
C．discussed
D．to be discussed
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单项选择题
After searching for half an hour, she realized that her glasses______ on the table all the time:
A．were lain
B．had been lain
C．have been lying
D．had been lying
单项选择题
As a______ president, his views are treated with respect when he is interviewed.
A．former
B．previous
C．late
D．prior
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