3.If he goes on running for_____two hours,he ______like that for hours.A.anther:will have been
题目
3.If he goes on running for_____two hours,he ______like that for hours.A.anther:will have been
3.If he goes on running for_____two hours,he ______like that for hours.
A.anther:will have been running B.a:will run
C.other:has run D.the:will be running
答案
选择A,这个人正在跑步,如果他在跑一个两小时,这是将来时,那他就一直跑了4小时.这是现在进行的,并有可能延续到将来的,所以要用will,将来时+现在完成进行时
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．
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