单项选择题

—The window is dirty.—I know. It______ for weeks.

A．hasn't cleaned
B．didn't clean
C．wasn't cleaned
D．hasn't been cleaned
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单项选择题
Mary said that she ______the cold for several days and still couldn't get rid of it.
A．had had
B．had caught
C．has caught
D．caught
单项选择题
I don't know whether you happen______, but I'm going to study in the U.S.A. this September.
A．to be heard
B．to be hearing
C．to hear
D．to have heard
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