we must get there before 7 o'clock.that's ___ we have to start so_英语解答

we must get there before 7 o'clock.that's ___ we have to start so early
A.the reason for why B.why
A.the reason for why B.why C the reason that

人气：234 ℃　时间：2020-01-24 06:35:32

解答

答案：B. 这儿的why we have to start so early .是个表语从句.整句意思是,我们必须七点前到哪儿,那就是我们不得不动身这么早的原因.至于答案A, 应该修改成 the reason for which, 这样就成了一个含有定语从句的复合句.