He often got up early when he was young( 同义句是什么 ) He_ _ _ up eariy when he was young
题目
He often got up early when he was young( 同义句是什么 ) He_ _ _ up eariy when he was young
还有:He was often sick in the past=He _ _ _ sick in the past
答案
第一个填：used to get
第二个填：used to be
这个题是考察句型used to do 的用法.
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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