they hadn't sailed for long.

问题描述:

they hadn't sailed for long.
they hadn't sailed for long____ a violent storm started,
A after B.since C.when D.while
为什么不是B呢.

选择C是正确的,过去完成时指的是过去的过去.如果你选B的话They hadn't sailed for long 就应该改为They hasn't sailed for long(现在完成时态)