They all agree that great changes __________ in Shanghai in the last few years.A.have happenedB.happenedC.were happening并给出让人信服的理由.
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题目内容：
They all agree that great changes __________ in Shanghai in the last few years.
A.have happened
B.happened
C.were happening
并给出让人信服的理由.
本题链接：
