The train left the station and lisa watched until it ______from view.(appear)
题目
The train left the station and lisa watched until it ______from view.(appear)
是disappear吧 但需要时态变化吗?
He has been in the army for about 10 years.(保持原句意思)
He_____the army about 10 years_____.
答案
disappeared 与前半句left保持相同的时态
joined,ago 原句是在部队待了10年=他在10年前参军了
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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