i tried to call you ______ i heard from him ,but you were not in / since while until because
题目
i tried to call you ______ i heard from him ,but you were not in / since while until because
答案
until,
意思是“直到我收到他的来信之前,我一直试图给你打电话,但你不在.”意思是“我一收到他的来信,就不给你打电话了(意思是知道你的情况了)”.
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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.
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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