We want to know___to help them.A what we can do B how we can do为什么选 B行吗

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We want to know___to help them.A what we can do B how we can do为什么选 B行吗

B不行,因为we can do的都缺少宾语,而what是做do的宾语的,how不能做do的宾语.所以只能用what we can do.

do后得有宾语,而what就是他的宾语

B不行,因为we can do的都缺少宾语,而what是做do的宾语的,how不能做do的宾语。所以只能用what we can do。