--Jim，it's going to rain．You'd better take ________ umbrella with you．

--Well，but I can't find ________ umbrella I put here yesterday．

A．a；a             B．a；the           C．the；an                D．an；the

(用所给词的正确形式填空) You'd better __________ (take) an umbrella with you．It's going to rain．