The story of Tom Sawyer ______ in Missouri, America, in the 19th century.
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A
had happened
B
was happening
C
has happened
D
happened
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I don’t know when he _______ tomorrow, when he    tomorrow ,I will tell you.
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A
will come;come
B
will come;comes
C
will come;will come
D
comes;would come
I’ll do it better if my mother _______ me to try one more time.
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A
allow
B
will allow
C
allows
D
allowing
My hometown ______ a lot  in the past ten years.
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A
change
B
changed
C
has changed
D
is changing