问题
选择题
If you keep ______ ,you’ll be a very good swimmer one day.
A．practising to swim
B．practising swimming
C．to practise to swim
D．practise swimming
答案
答案：B
题目分析：句意：如果你一直练习游泳，有一天你会成为好的游泳运动员。keep doing dth 一直做某事，practise doing sth 练习做……，根据句意及结构，故选B。