—— Look at the black clouds.It ＿＿＿＿＿＿ soon.
—— Sure.If only we ＿＿＿＿＿out.

A．is raining； didn’ t come

B．is to rain； won’ t start

C．will rain； haven’ t started

D．is going to rain； hadn’ t come