—What is your brother doing in the study? —He _______

试题详情及答案解析: —What is your brother doing in the study? —He ________ his homework.
A. is doing B. did C. doe; 答案：A; 试题分析：句意：你的哥哥在书房正在做什么？他正在做作业。根据提问可知用现在进行时，be doing，故选A。
考点：考查现在进行时的用法。