When ______ why he walked in without permission,he just stared at us and said nothing.A.been asked\x05B.asked\x05C.asking \x05D.to be asked 为什么不选B ,而选A?

When ______ why he walked in without permission,he just stared at us and said nothing.A.been asked\x05B.asked\x05C.asking \x05D.to be asked 为什么不选B ,而选A?
When ______ why he walked in without permission,he just stared at us and said nothing.A.been asked\x05B.asked\x05C.asking \x05D.to be asked
为什么不选B ,而选A?

When ______ why he walked in without permission,he just stared at us and said nothing.A.been asked\x05B.asked\x05C.asking \x05D.to be asked 为什么不选B ,而选A?
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.

B A 是错误的。当他被问到为何未经允许进入时
这是状语从句的省略。省略之后只有两种形式：连词+v-ing或者连词+v-ed.
是不是答案对错了。