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【单选题】

Responsibility for family is ________ happiness exists when you think of your parents and children.

A.
which
B.
what
C.
where
D.
whether
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参考答案:
参考解析:
.
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举一反三

【单选题】My sister met him at the Grand Theatre yesterdays afternoon, so he ________ your lecture.[ ]

A.
couldn't have attended
B.
needn't have attended
C.
mustn't have attended
D.
shouldn't have attended