do you often hear Lucy in her room? -- Yes listen! Now we can hear her in her room.A.

问题补充：

--do you often hear Lucy in her room?

-- Yes, listen! Now we can hear her in her room.

A. sing; sing

B. singing; singing

C. singing; sing

Dsing; singing

答案：

A. sing; sing

B. singing; singing

C. singing; sing

(答案→)D. sing; singing

解析：句意：你经常听见Lucy在她房间唱歌吗？是的，听，现在我们能听见他在她方房间唱歌。hear sb do sth 听到某人做某事.暗示过程完成如:我听到他关掉电视.I heard him turn off the TV.hear sb doing sth 听到某人正在做某事.强调动作的进行.可能你听到的只是动作的一部分.如:我经过这里时听到有人唱歌.I heard someone singing when I passed by.根据题意故选D