The inspector began to look for fingerprints,while the constable checked that the front door locks h
题目
The inspector began to look for fingerprints,while the constable checked that the front door locks had not been forced,thereby proving that the burglars had either used skeleton keys or entered over the balcony.
这句是proving 是现在分词做状语修饰checked吧?它的逻辑主语是谁?
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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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