1.what was he doing when his parents came back?2.who were you talking to when i called you last night?3.it was raining heavily outside when i woke up.4.was you father sleeping when the telephone rang?5.i was looking out of the window when the teacher asked me a question.1.were playing;saw2.was;writingwhat to do...
看仔细：1.what was he doing when his parents came back?2.who were you talking to when i called you last night?3.it was raining heavily outside when i woke up.4.was you father sle...
