The zoo keeper is worried because the number of visitors ______ smaller and smaller .
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A
is becoming
B
become
C
became
D
to become
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His grandparents ______ Hangzhou for 40 years. They like living there.
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A
have been in
B
have been to
C
have gone to
D
have moved to
I_______ my homework when the door bell__________.
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A
did, rang
B
was doing, was ringing
C
did, was ring
D
was doing, rang
—Will you come to the dinner party?---I won’t come unless Jenny ___________。
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A
will be invited
B
can be invited
C
invited
D
is invited