单项选择题


A．on
B．by
C．with
D．in
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单项选择题
A．howB．whatC．whichD．why
A．how
B．what
C．which
D．why
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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