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【单选题】

— Why does the boy keep crying?
— It is ______ he has lost his favorite car model.

A.
since
B.
so
C.
when
D.
because
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参考解析:
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【单选题】253.Great changes ________ for the latest twenty years in China.

A.
have taken place
B.
have been taken place
C.
have happened
D.
have taken the place of