the river( ) ice four inches thick A covers with B is covering with C covered to D is covered with 这
题目
the river( ) ice four inches thick A covers with B is covering with C covered to D is covered with 这里各个选项求详解
答案
选D is covered with 被覆盖着the river (is covered with) ice four inches thick.河面被4英尺厚的冰层覆盖着.is covered with (is done + with,过去分词 + 介词) 表被动,with后面接被 '什么' 东西覆盖.句子时态：...
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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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