一道名词性从句题目3. It is no longer a question now ___ man can land
一道名词性从句题目 3. It is no longer a question now ___ man can land on the moon. A. that B. which C. whether D. what 答案选a,我觉得选c,因为同位语从句补充说明的是前面的a question,那不应该用whether引导从句吗?大家觉得呢? 不好意思,我搞错了,这的确是主语从句。我提问的关键是为什么用that,不用whether。