单项选择题Only after the second tower of the World Trade Centre did people know it was not an accident, but an attack of some kinD. A.had hit B.did fall C.was hit D.was fallen
单项选择题__ , she knew she'd never been there beforE.
单项选择题We were just about to leave_______ it started to snow.A.when B.before C.after D.since
单项选择题The dish_____ nice , but the milk _____ sour.A.is smelt , is smelt B.is smelt , smells C.smells , is smelt D.smells , smells
单项选择题----- What’s made you so upset ?---- ______ three tickets to the pop music concert..A.Lost B.Losing C.Because of losing D.Since I lost