It describes when someone else accepts responsibility to act in the interests of a child.我感觉，本句的宾语是when引导的是从句，可是这样的话就成为时间宾语从句，好像没这种说法啊？况且语义也不顺。请老师讲解一下本句吧？谢谢老师，让您见...
以下两道题均考查when, while, as的用法区别：1. The boy smiles _______ the teacher praises him. A. when
B. while
C. as
D. since2. _______ he was sent to prison, the children were taken into care.
A. When
B. While
C. As
D. Since凭感觉应该是选when，但说不出理由，请...
The snow was getting deeper and deeper when/while/as we waited for the
train to arrive.看到一道题，答案是while或as，不可用when。可是《新编英语语法教程》说主句和从句如果都表示持续性动作，并且同时发生，持续时间大致相等，前后都用一般过...