His mother is very busy.She spends much time__housework.a.to do b.does c.doing d.do
问题描述：
His mother is very busy.She spends much time__housework.a.to do b.does c.doing d.do
答
c,spend time in doing sth.(in可以省略)
spend time on sth
答
C
spend time on doing sth.花时间做某事。on可以省略
答
C
答
a.to do