He spends,I think,a lot more time in reading English than I do__(learn) French.
问题描述：
He spends,I think,a lot more time in reading English than I do__(learn) French.
答
learning，首先这个动词与reading并列，其中有巨型spend sth in doing sth进而可得到答案
答
learning
我认为，他花在读英文上的时间要比我用来学法语的时间多得多。
祝你学习进步，天天开心！
答
learning
从句为了避免重复,用了个代动词do=spend a lot of time (in),可见要接动词ing形式（和主句一样的）
答
填 learning
do是省略 = spend time in learning