问题
选择题
They kept trying _____ they must have known it was hopeless.
A．if
B．because
C．when
D．where
答案
答案：C
when在此的意思不是“当……的时候”，而是“尽管”、“虽然”的意思。又如：He walks when he might take a taxi.尽管他可以坐出租车，但他却走路。He stopped trying when he might have succeeded next time.尽管他本来下次就可以成功的了，但他却停止努力了。
【标签】熟词生义