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--- I didn’t see you at the party yesterday. Why?  --- Because I ________ for an important person from America at that time.
#40452
A
was waiting
B
is waiting
C
will wait
D
have waited
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When the teacher ______ how to do the experiment, the bell rang.
#37863
A
explains
B
will explain
C
was explaining
D
is explaining
What ____________ at nine o’clock last Sunday morning.?
#40551
A
was you doing
B
were you doing
C
are they doing
D
do you do
Have you ever ________ the Great wall?
#40391
A
been to
B
gone to
C
go to
D
been
he girl sitting next to me on the plane was very nervous, for she            before.
#36660
A
hasn’t flown
B
hadn’t flown
C
didn’t fly
D
wasn’t flying
—I called you yesterday evening, but there was no answer.—Oh, I’m sorry. I ________ dinner in my friend’s home.
#41832
A
have
B
will have
C
was having
D
have had