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

【答案】B
【解析】句意:自從1978年以來,中國發(fā)生了很大地變化。由since 1978可知該句的時態(tài)為完成時,而選項中只有B符合。

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