问题
选择题
The pilot,(飞行员) whether ______ or on purpose, made the plane do a sharp turn.(急转弯)
A.by accident
B.at times
C.suddenly
D.at once
答案
答案:A
考查短语必须。by accident偶然;at times有时;at once立刻。根据句意:是偶然的或有目的的,故选A。