She was working in the room suddenly she heard a boy crying and out as quickly as she cou

问题补充：

She was working in the room suddenly she heard a boy crying and out as quickly as she could to see what was happening.

A. going

B. go

C. had gone

D. went

答案：

A. going

B. go

C. had gone

(答案→)D. went

解析：went 和heard 是主语并列的两个谓语动词,不是 a boy 的补足语。