——Why is the classroom so dirty?——Sorry, Sir. It _____ yesterday. We forgot to do it.
#41937
A
doesn’t clean
B
didn’t clean
C
isn’t cleaned
D
wasn’t cleaned
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Mr. and Mrs. Black ______ back _________.
#41874
A
hasn’t come, yet
B
haven’t come , yet
C
haven’t come， already
D
hasn’t come , already
—What were you doing when I called you at 8 p.m. yesterday? —I the piano at that time.
#37831
A
play
B
is playing
C
played
D
was playing