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

答案及解析： D

解析：

译文: 他们一到站点公共汽车就突然开走了。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。