l often went to school by bike.(保持原句意思) l ______ _______go to school by bike.
题目
l often went to school by bike.(保持原句意思) l ______ _______go to school by bike.
答案
used to
used to 过去常常
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
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