What caused the accident and who was responsible for it_____a mystery to us.
题目
What caused the accident and who was responsible for it_____a mystery to us.
为什么选B而不选A?
答案
答案是remains 吗谁造成事故和谁应该对它负责对我们仍然是个谜.不及物动词 vi.[W]1.剩下,余留A few pears remain on the trees.树上尚留有几颗梨子.2.继续存在Little of the original architecture remains.原先的建...
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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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