The film started ten minutes ago.保持原意 The meeting _____ _____ _____for ten minutes.
题目
The film started ten minutes ago.保持原意 The meeting _____ _____ _____for ten minutes.
还有The meeting ended half an hour ago.保持原意
The meeting _____ _____ ______for half hour.
答案
The film started ten minutes ago.保持原意 The film _has_ _been_ _on_ for ten minutes.
The meeting ended half an hour ago.保持原意 The meeting _has_ _been_ _over_ for half hour.
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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