The story of Tom Sawyer ______ in Missouri, America, in the 19th century.
#38846
A
had happened
B
was happening
C
has happened
D
happened
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If we __________ careful,fire can be dangerous。
#41667
A
don’t be
B
are
C
aren’t
D
won’t be
You have been to Beijing. How long _______ you ______ there/
#41923
A
did…stay
B
have…stayed
C
do…stay
D
will…stay
When I went to say goodbye to Ann, she ______ the piano.
#41656
A
plays
B
played
C
has played
D
was playing