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[单选题]
Our country has _______ great changes in the past years , which are the result of reform and opening up.(1分)
A
appeared
B
happened
C
taken place
D
witnessed
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试题答案：
D
答案解释：
解题思路：witness意为“见证”，又是及物动词，满足该句子空格后great changes 是宾语的条件，故选D
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