单项选择题


A．how
B．what
C．which
D．why
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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
单项选择题
I often see lights in that empty house. Do you think I ______ report it to the police
A．should
B．may
C．will
D．can
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