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
--Would you mind repeating what you said, I didn't (). --Of course not.

A．catch on
B．go on
C．keep on
D．insist on
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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