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【单选题】

There _____ a mother, a father and children in the family.

[ ]

A.
be
B.
have
C.
are
D.
is
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参考答案:
参考解析:
.
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举一反三

【单选题】_____ you study math, _____ you'll be at it.[ ]

A.
Harder; better
B.
The better; the harder
C.
The harder; the better
D.
The more; the more