while walking along the river,they suddenly heard somebody _____for help
题目
while walking along the river,they suddenly heard somebody _____for help
A called B to call C calling D calls
答案
Chear sb. doing sth.” 的意思是“听见某个动作的 一部分”,或者意为“听见这个动作正在进行”; 而“hear sb. do sth.”则表示“听到整个动作”, 或者意为“听到这个动作完成了”.例如: When I passed her room, ...
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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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