－When shall we set off?

－We ____ start off at five o’clock if it ___ raining by then.

A．will; has stopped

B．are about to; stops

C．are going to; will stop

D．are to; will stop

—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