关于原因状语从句＿＿ being Sunday,the library was closed为什么填it

The library is now closed.The library was closed.The library I wasted an hour____ to the library only ____ it was closed 关于状语从句和强调句Was it at the meeting on September 20 2007,______ Put back the book where it was.为什么是状语从句 the library is closed. I think the shop is closed now.为什么填closed 求翻译时间状语从句It was 1949 when the people"s republic of China was A new library ＿＿in my hometown now. A.was built B.was being I think it's hot with the door______.为什么要填closed 关于原因状语从句语法的问题. it was the factory where the accident happened.这是地点状语从句?还是定语 1,关于it is/was+...+when,when引导时间状语从句与it is/was+...+that...强调句