思考与探究 1.单项选择。 C )1.My mother back home I went to bed. A.don’t come,after B.returned,until C.didn't come,until D.returned,as soon as A )2.Great changes in my city last year. A.took place B.happened C.takes place D.happens 导航页导航页 思考与探究 Ⅰ.单项选择。 ( )1.My mother back home I went to bed. A.don’t come,after B.returned,until C.didn’t come,until D.returned,as soon as ( )2.Great changes in my city last year. A.took place B.happened C.takes place D.happens C A