问题
选择题
Nancy spent half an hour _______ playing the piano every day.
A．practice
B．practicing
C．to practicing
D．to practice
答案
答案：B
题目分析：句意：Nancy 每天花半小时练习弹钢琴。spent 的原形是spend，spend sometime doing sth.花费时间做某事。故用动词的ing形式，故选B。