Many farmers arrive in Shengzhen for money-making jobs which ____before leaving their hometown.
题目
Many farmers arrive in Shengzhen for money-making jobs which ____before leaving their hometown.
空格部分是they have promised还是they have been promised
答案
选择:they have promised.
而they have been promised 若看做被动语态,没有这种用法;若将其看成是be+表语,promise也没有此种用法.
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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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