Nancy quickly ________ the door and put down her school things.
#53553
A
opens
B
opened
C
has opened
D
is opening
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A number of tourists ____ Yangzhou many times because it is such a beautiful city.
#52204
A
have been to
B
has been to
C
has gone to
D
have gone to
— Air quality in our city is becoming worse and worse.—Yes. These days' PM2.5 readings are frightening. We must do something to ______air pollution.
#55017
A
reduce
B
remove
C
collect
D
gather