1、Mary came to France in1940,and it wasn't long ____she became a France citizen.
A、while B、before C、 since D、when
2、It will take many years ____all this rubbish can be got rid of.
3、It is years ____I enjoyed myself so much.
4、It tooks us five hours ____we got back to the camp
选项都是:A、when B、since C、after D、before
讲下要求:分析选哪个并翻译句子意思。