.They went to London ______ just over five months.

问题描述:

.They went to London ______ just over five months.
A.for B.since C.before D.when

C
句子的意思是他们去伦敦已经五个月了.
解析:A 用for的话 后边是一个时间段,前应该是用完成时,如
They had been in London ...
B since 后接时间点
D when 与句意不符