Sally spends a lot of time ______ exercise,but Helen spends little time ______ it.
问题描述：
Sally spends a lot of time ______ exercise,but Helen spends little time ______ it.
A.doing,in B.to do,in C.doing,on D.to do,on
答
选C咯:)
考的是spend time doing sth和spend time on sth的用法