问题补充：
To our surprise, not a single word in the discussion last Thursday.
A. had the teacher said
B. said the teacher
C. the teacher had said
D. did the teacher say
答案：
A. had the teacher said
B. said the teacher
C. the teacher had said
(答案→)D. did the teacher say
解析：考查倒装句。否定词放在句首，使用部分倒装，根据时间last Thursday，故选D，句意：使我们吃惊的是，上个星期四在讨论中老师一句话都没说。
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