Only by shouting at the top of his voice ______.
题目
Only by shouting at the top of his voice ______.
A) he was able to make himself hear
B) was he able to make himself hear
C) he was able to make himself heard
D) was he able to make himself heard
为什么选D,
答案
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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