单项选择题

The road ______ I drive to work is always crowded.

A．which
B．on that
C．that
D．on which
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单项选择题
They repeated the experiment several times ______ they were sure that the result was reliable.
A．until
B．for
C．since
D．when
单项选择题
I had hoped that I ______ the lecture on American Romanticism.
A．attend
B．attending
C．could attend
D．can attend
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