how long do you think it will be___china sends a manned spaceship to the moon?
题目
how long do you think it will be___china sends a manned spaceship to the moon?
a when
b before
用哪个?
答案
B before
因为跟的是一段时间(HOW LONG)
如果用when要跟确切的时刻
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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