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问题: 30.They kept trying ________ they knew it was hopeless.

30.They kept trying ________ they knew it was hopeless.
A.when
B.unless
C.as
D.till
为什么该题不选till,要选when

解答:

when在这里作"即使,尽管"解,而不能按照常规的理解为"当......的时候",这句话的意思是说:尽管他们知道希望渺茫,但还是一直在努力尝试。
不知这样解释你明白了吗。