问题补充：
Hardly when the bus suddenly pulled away.
A. they had got to the bus stop
B. they got to the bus stop
C. did they get to the bus stop
D. had they got to the bus stop
答案：
A. they had got to the bus stop
B. they got to the bus stop
C. did they get to the bus stop
(答案→)D. had they got to the bus stop
解析：否定副词hardly放于句首构成倒装句。Hardly+had+主语+done when...did...是固定的句式。选项A
