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t that he didn39。蘇州 — Why are you so late today? — Three buses went by without stopping while I ________ at the bus stop. A. am waiting B. waited C. have waited D. was waiting B 單元語法聚焦五 D ( ) 成都 Yesterday, I ______ the subway home when I suddenly found I was on the wrong line. A. took B. was taking C. had taken A 單元語法聚焦五 語 法 精 練 B ( ) 如: When were you born?你是什么時候出生的? 單元語法聚焦五 ( ) 如: I was trying my best to finish my work while my sister was watching TV. 我妹妹在看電視時,我正盡全力完成工作。如: While we were talking, the teacher came in. 當我們