I was halfway back to the hospital where the doctor was working _________ Susan caught up with me．

1. A.
   when
2. B.
   while
3. C.
   until
4. D.
   though

I was halfway back to the hospital where the doctor was working      Susan caught up with me．

       A．when B．while C．until  D．though

I was halfway back to the hospital where the doctor was working      Susan caught up with me．

A．when         B．while         C．until          D．though

I was halfway back to the hospital where the doctor was working      Susan caught up with me.

A．when          B．while            C．until           D．though

I was halfway back to hospital where the doctor was working ________ Susan caught up with me.

A. while　　　　 B. until　　　　　　　　 C. when　　　　　　　 D. though