问题补充：
Alice has gone to the classroom and she didn’t say.
A. how did she come back
B. how soon would she come back
C. when she came back
D. when she would come back
答案：
A. how did she come back
B. how soon would she come back
C. when she came back
(答案→)D. when she would come back
解析：句意：爱丽丝已经去教室了而且她没说什么时间回来。宾语从句的语序用陈述语序，排除A和B，根据句意应该是表示过去将来，而不是一般过去时，所以排除C；故选D。
