楼主你好!!首先答案为:C分析:【可供参考,希望能让你更清晰~~】spend的主语必须是人,常用于以下结构:(1) spend time /money on sth.在……上花费时间(金钱).例:I spent two hours on this maths problem.这道数学题花了我两个小时.(2) spend time /money (in) doing sth.花费时间(金钱)做某事.例:They spent two years (in) building this bridge.造这座桥花了他们两年时间.(3)spend money for sth.花钱买…….例:His money was spent for books.他的钱用来买书了。由spend的第二个用法,我们可知应为:practicing接下来我们知道practice doing sth.所以应为:practicing speaking故答案为:Co(* ̄︶ ̄*)o希望我的答案能帮到你!!加油~~ヾ(◍°∇°◍)ノ゙