请教几个题目~最好能解释的详细点`~

Scarely______themselves in their seats in the theatre ____the curtain went up
A did they settle;when B did they settle ;than
C had they settled;when Dhad they settle ;than

________preparing dinner,she stood at the front door waiting for her husband to return

A Being finished B Finished
C Having finished D Having been finished

这题我选的是d`~为什么不能选这呢
再加道`~
They still_____to the old idea.
A cling B hold
C grasp D support
A B 与TO连接都有坚持的意思`~为什么要选A~~

小弟个人积分不高`~只能悬赏5分了~~谢谢大家回答`~

请教几个题目~最好能解释的详细点`~ 请教几个英语句子的详细解释 请教几道专四的题目。要详细解释喔~ 请教几个英语题目!急需知道.希望能解释原因.谢谢. 请教几个文言文的题目！ 英语题目(详细解释) 请解释下面几个VB的题目.. 请教一句诗句的意思，最好能详细些 几道数学题目{希望能详细解释} 【这道题目有人能详细解释下吗？】