搜题，就来5TiKU.com题库【问题】 Billy has difficulty _______ the rest of the class.Ato keep up withBto keep upCkeeping up withDkeeping on
Billy has difficulty _______ the rest of the class.Ato keep up withBto keep upCkeeping up withDkeeping on
正确答案：C
题目解析：本题出自辽宁科技学院，辽宁科技学院大学英语(三)(专升本)，由丰阳塔题库搜集整理。
公益网站无广告，打赏一杯咖啡鼓励下吧
放广告影响您看答案的心情，不放又没收入，顺手打赏一下？
广告影响看答案的心情，来点打赏行不行？