问题补充:
The past 30 years has the great changes that have taken place in China.
A. seen
B. noticed
C. watched
D. looked
答案:
(答案→)A. seen
B. noticed
C. watched
D. looked
解析:考查动词:A. seen 看见,见证B. noticed注意到C. watched观察D. looked看,句意:过去30年已经见证的中国的巨大变化。选A。
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