he was running as quickly as he could ________ (catch)the bus .该用哪种形式.
题目
he was running as quickly as he could ________ (catch)the bus .该用哪种形式.
答案
用原形catch 情态动词could后面一定是接动词的原形
他尽可能的快跑追赶公车
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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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