【题目】The recent 40 years great changes taking place all over China.
A. witnessed B. has witnessed
C. had witnessed D. witnesses
在线课程【答案】B
【解析】
考查时态。句意：近40年来，中国发生了巨大的变化。表示动作开始于过去某一时刻，一直延续到现在，或可能还要继续下去，用现在完成时，故选B。
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