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
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科目：初中英語 來源：廣東省競賽題 題型：單選題

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

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