问题描述: could(can) only...if...could(can) only...if...这个句型的用法。 1个回答 分类:英语 2014-12-14 问题解答: 我来补答 You could succeed if you put your heart into it.只有用心,才能成功.One can only borrow three books or more,if he/she has a library membership.只有图书馆会员才能借多于三本的书. 展开全文阅读