Question

--- I rang you at about ten, but there was no reply.
--- Oh, that was probably _____ I was seeing the doctor.

A．for

B．why

C．when

D．how

Answer 1

C

考查连词。根据上下文可的句意知C正确。句意—我在10点打你电话，但是没有回音。—那也许就是在我去看医生的时候吧。