My mother _____ all the cleaning for my family, but recently she has been too busy teaching to do it.
#99234
A
will do
B
is doing
C
does
D
had done
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Ever since Ming furniture went on exhibit in Beijing, there large crowds at the World Art Museum every day.
#99323
A
was
B
have been
C
has been
D
were
If the weather had been better, we could have gone outing. But it ____ all day.
#100919
A
rains
B
has rained
C
had been rained
D
rained
Allen has decided that he will be an engineer by the time he ________ twenty.
#99481
A
had been
B
is going to be
C
will be
D
is
(2013·高考江西卷)I________to visit you later that day，but I had to phone and cancel.
#99692
A
come
B
came
C
am coming
D
was coming
If we ___________some measures, we might have prevented the environmental pollution.
#103274
A
take
B
had taken
C
took
D
have taken