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

zyb123888 1年前已收到3个回答举报

浙理工小人物幼苗

共回答了14个问题采纳率：92.9% 举报

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

1年前

lxdfwy 幼苗

共回答了7个问题举报

1年前

小波aini 幼苗

共回答了6个问题举报

b,省略了 how to work out the problem

1年前

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你能帮帮他们吗

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