When I come in, I found a strange girl ______in the corner.
#103163
A
seating
B
seated
C
to be seating
D
seat
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—The window is dirty.—I know. It ______ for weeks.
#102943
A
hasn’t cleaned
B
didn’t clean
C
wasn’t cleaned
D
hasn’t been cleaned
What do you think ____________ at this time last night?
#101008
A
has he done
B
he has done
C
was he doing
D
he was doing
When his wife returned from abroad, Kevin ____ his paintings at the art museum in his hometown. 
#100569
A
was exhibiting
B
exhibited
C
would exhibit
D
had been exhibiting