Linda and her sister____healthy.
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A
is
B
am
C
be
D
are
推荐题目
Four-fifths of the crop ______. 
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A
are ruined
B
was ruined
C
were ruined
D
have been ruined
There _____ an American film “Titanic” in the cinema next Sunday.
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A
puts on
B
will have
C
is going to be
D
is going to have
When  ______  the United Nations founded?
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A
is
B
are
C
was
D
were