21. (单选题) When I tried to find _______that prevented so many people from taking part in the program, it seemed to me that there were two main reasons.( )(本题3.0分) A、 why it did B、 that it did C、 what it was D、 why it was

21. (单选题) When I tried to find _______that prevented so many people from taking part in the program, it
seemed to me that there were two main reasons.( )(本题3.0分)
A、 why it did
B、 that it did
C、 what it was
D、 why it was

出自：赤峰学院- 综合英语II(专升本)

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