问题补充：
The teacher and writer as well as some students something when we entered the room.
A. discussed
B. were discussing
C. have discussed
D. was discussing
答案：
A. discussed
B. were discussing
C. have discussed
(答案→)D. was discussing
解析：句意：当我们进入房间时， 这位老师兼作家及一些学生正在讨论某事。 “A +aswellas+B”结构作主语时，句子谓语与A 保持一致。此 处主语“Theteacherandwriter（老师兼作家）”指 一个人，故谓语用单数。因为时间状语从句是when we entered the room.故用过 去进行时。选D。
