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
-- What were you up to when she dropped in --I () for a while and () some reading.

A.was playing, was going to do
B.played, did
C.had played, was going to do
D.had played, did
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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