he didn't work out the problem ( ) I explained ( ) to him
he didn't work out the problem ( ) I explained ( ) to him
A.until,what B.until ,how
选哪一个,为什么
我选what,不是说how应该有it之类的吗，what后面没有，为什么这题选B呢
A.until,what B.until ,how
选哪一个,为什么
我选what,不是说how应该有it之类的吗，what后面没有，为什么这题选B呢
英语人气：918 ℃时间：2019-11-19 12:24:30
优质解答
选B 他一直没有解决这个问题直到我向他解释如何（去解决）这里的how代指如何解决 前面是explain sth to sb的用法 这里省略了how 后面的to do it ,而且what跟语意完全不符
我来回答
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