—I rang you at about nine, but there was no reply.

         —Oh, that was probably__________I was seeing the doctor.

         A．why    B．when   C．what      D．that

—I rang you at about nine, but there was no reply.

—Oh, that was probably       I was seeing the doctor.

A．why                B．when                C．what                 D．that

—I rang you at about nine, but there was no reply.

       —Oh, that was probably       I was seeing the doctor.

       A．why  B．when C．what  D．that

—I rang you at about nine, but there was no reply.

—Oh, that was probably       I was seeing the doctor.

A．why                B．when           C．what           D．that

— I rang you at about nine, but there was no reply.

— Oh, that was probably _____I was seeing the doctor.

A.why        B. when    C. what      D. That

—I rang you at about nine, but there was no reply.
—Oh, that was probably__________I was seeing the doctor

1. A.
   why
2. B.
   when
3. C.
   what
4. D.
   that