单项选择题

—Would you like to come to dinner tonight
—I'd like to, ______I'm too busy.

A．and
B．so
C．as
D．but
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单项选择题
This method, ______in the area near Shanghai, resulted in a market rise in total production.
A．trying
B．tried
C．was tried
D．has been tried
单项选择题
The bus was so crowded that he had a hard time______.
A．got off
B．getting off
C．to get off
D．get off
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