英语：All the apples () fell down from the tree were eaten up by the pigs.
题目
英语：All the apples () fell down from the tree were eaten up by the pigs.
All the apples () fell down from the tree were eaten up by the pigs.
选which 还是 that 还是 /（省略）
请分别说明下原因,
我比较混乱
用that 那which 和/错在哪里
答案
这个没什么纠结的
all修饰的先行词
关系代词固定用that
举一反三
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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