题目内容

【题目】China ________ a lot since 1978.
A.changed
B.has changed
C.was changed
D.is changing

【答案】B
【解析】句意：自从1978年以来，中国发生了很大地变化。由since 1978可知该句的时态为完成时，而选项中只有B符合。

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