— the door please.—Come in please. The door .A. Be open; opensB. Be open; is openingC. O

问题补充：

— the door, please.

—Come in please. 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：句意：--请开门。--请进。门是开着的。第一句是祈使句，需要动词“开门”所以要用open。第二句是表示“门开着的”状态。be open这里的open 是形容词。故选D.