They _____ some presents for Aunt Judy and Uncle Mike already.(buy)(写理由与答案)
题目
They _____ some presents for Aunt Judy and Uncle Mike already.(buy)(写理由与答案)
答案
They have bought some presents...already.
have + 现在分词,现在完成时,已经
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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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