一道英語題關於賓語從句they have done what they can__(help)the childreni

題目：

一道英語題關於賓語從句they have done what they can__(help)the childrenin poor areas
爲什麼what they can__(help)the children in poor areas不可以當做一個賓語從句呢

解答：

They have done what they can__(help)the children in poor areas.下面分析整個句子的成分：
They （主語）have done（謂語）what they can（賓語從句）to help the children in poor areas（不定式短語,做目的狀語）句子翻譯：爲了幫助貧困地區的孩子,他們已經做了他們能做的事情.希望對你有所幫助!

再問： 爲什麼
再答： what they can (do)是名詞性從句，做ave done 的賓語，所以是賓語從句。