问题补充：
They waited and waited. they had been looking forward to.
A. Then the hour came
B. The hour then came
C. Then came the hour
D. Then did the hour come
答案：
A. Then the hour came
B. The hour then came
(答案→)C. Then came the hour
D. Then did the hour come
解析： then类似的的词语在句首句子要完全倒装。
