Bill is very shy.He is afraid___in front of people A of speaking B speak C to speaking D of speak
题目
Bill is very shy.He is afraid___in front of people A of speaking B speak C to speaking D of speak
答案
A
be afraid of doing sth 害怕做某事
of 是介词,后接v-ing 形式
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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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