问题补充：
Some children pictures when the teacher came into the classroom.
A. draw
B. are drawing
C. were drawing
D. will draw
答案：
A. draw
B. are drawing
(答案→)C. were drawing
D. will draw
解析：句意：当老师走进教室时，一些学生正在画画。When引导的时间状语从句，主句有过去进行时从句用一般过去式。When引导的时间按状语从句主句中的动作限于从句的动作，且进行的时间较长主句用过去进行时，根据题意故选C.
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