问题
选择题
When they visited their hometown, they saw many changes ______ in that area. [ ]
A. were happened
B. which was happened
C. which had been happened
D. which had happened
答案
答案：D
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When they visited their hometown, they saw many changes ______ in that area. [ ]
A. were happened
B. which was happened
C. which had been happened
D. which had happened
答案：D