He has been away for a week.___ ____ ____ he been away?对划线部分提问 还有一题
题目
He has been away for a week.___ ____ ____ he been away?对划线部分提问 还有一题
He has been here since yesterday.
____ ____ ____he _____ ____?
能稍微讲解一下不能.
答案
How long has
for a week 表示一段时间,提问用多久,即how long
How long has,been here
since 自从.起,提问也用多久 how long
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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．
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