问题描述：
Math is than Chinese,I think.
A.more difficulter B.much difficulterC.difficuit D.much more difficult
要说明的的的的的的的的的的！
A.more difficulter B.much difficulterC.difficuit D.much more difficult
要说明的的的的的的的的的的！
问题解答：
我来补答展开全文阅读