Where is he?—He ______ to the teacher’s office.And he ______ there for two hours
题目
Where is he?—He ______ to the teacher’s office.And he ______ there for two hours
填 has been to 还是 has gone to 为什么
答案
have gone to ,have be
第一空 have gone to 失去了某地人未回,have gone to 是去过某地人已回
第2空have been in sp. for +一段时间,又因为是there,省略in
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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