The construction of the two new railway lines ———by now.
题目
The construction of the two new railway lines ———by now.
A、has completed B、have completed C、have been completed D、has been completed
答案
D
首先,by now表明要用完成时,其次主语是construction 不可数名词,谓语动词用has不用have,再次,铁路线被修建,被动句,故选择 has been completed
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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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