you re next:My book is gone.Who---have taken it?

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为什么要选could

What struck the audience most was__the blind girl could accomplish with her won hands.
答案是what 是不是因为 accomplish是及物动词，what 做宾语

因为问者本人也不能确定是别人拿走了他的书还是自己弄丢了，这里只表示这种可能性，即“可能是谁拿走了呢”。情态动词里表示可能性的只有could，may，might,其中用could比较委婉，这里应该用could。
至于第二个你想的是对的。

先回答你第一个. 情态动词+完成时态表示对事件的揣测.
书不见,你会想"谁可能拿了呢?"所以顺理成章就先could了解情况:)
第二个, 这个用what作为连接词,是因为was后面的半句是一个宾语从句.整个句子是个表语从句形式.
你说的对,是what在这里面就是accomplish后面所指代的宾语

My book is gone.Who---have taken it? My sister is who? My uncle is a bookseller.His job is ______ book who is The best in my life who 后面应该接has 还是have 例如 who have/s my book? 《If we Evre Break UP this Is My book》 I don't know ( ) book it is. A.who B.who's C.whose The girl which is reading a book under the tree is my sister.这句知错在哪儿 My aunt has a borther.He not my uncle.Who is he? My clock has gone wrong.