She often spends half an hour_____ sports.A.to do B.doing C.do D.on doing
题目
She often spends half an hour_____ sports.A.to do B.doing C.do D.on doing
答案
B.doing
spend time (in) doing sth. 花时间做某事
spend time on sth. 在某事上花时间
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
热门考点