When ______ why he walked in without permission,he just stared at us and said nothing.A.been askedx0
题目
When ______ why he walked in without permission,he just stared at us and said nothing.A.been askedx05B.askedx05C.asking x05D.to be asked
为什么不选B ,而选A?
答案
主句的he能执行这个动作,那就是主动,如果是被问,那就是被动.
例如：When asked when he went there,he did not know how to answer.
他被问.
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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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