Do you know what these books are useful _________?A.to B.for C.with D.at

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Do you know what these books are useful _________?A.to B.for C.with D.at
Do you know what these books are useful _________?A.to B.for C.with D.at

Do you know what these books are useful _________?A.to B.for C.with D.at
D.at
在.方面有用

（what） are they useful （for）？
他们是用来做什么的
be useful to sb
固定短语对某人有用
祝你学习进步O(∩_∩)O哈！
如果对你有所帮助，还望采纳O(∩_∩)O哈！
如还有不懂的，还可以继续追问哦\(^o^)/~

be useful to 对…有益
be useful at 精通
be useful for 对……有作用
do you know what these books are useful _? = do you know these books are useful _ what?
意思就是说，你知道这些书对“什么”有用吗？
所以，应是for

选B

what do you know about the Do you know what c___ the fire Do you know what the answer is? what do you know Do you know what Do you know what? what will you do when you ______(know) the way do you know what's the matter?还是do you know what the matter is?为什么?do you know what's wrong with that?what 是什么成分？主语？ Do you understand the sad heart?What do you know?What I can move you? Do you know what this means?=Do you know the ___ ___this word? What else do you know about the ostrich?什么意思 What else do you know about the12? Do you know what the White House is?如何翻译? What do you know about the American symbols? Do you know what the old man does do you know what（）（ cause）the traffic accident Do you know what the wordwheel m_____ in chinese. What do you know about the Olypic Games 翻译