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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.

     A. why it did    B. that it did   C. what it was   D. why it was

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.

A. why it did    B. that it did   C. what it was   D. why it was

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.

A. why it did    B. that it did    C. what it was   D. why it was

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．

       A．why it did    B．that it did      C．what it was   D．why it was

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.

　　A. why it did　　B. what it did　　C. what it was　　D. why it was