---the door please.-Please come in. The door.A. Be open; opensB. Be open; is openingC.

问题补充：

---the door please.

---- Please come in. The door.

A. Be open; opens

B. Be open; is opening

C. Open; opens

D. Open; is open

答案：

A. Be open; opens

B. Be open; is opening

C. Open; opens

(答案→)D. Open; is open

解析：open可以用作动词打开，也可以用作形容词开着的。句意：请打开门。——请进，门开了。结合语境可知上文用作动词，打开。下文用作形容词作表语。故选D。