I am sorry you can not take that train it( )ten minutes agoA left B was leaving C will leave D leaves( )i was watching tv at nine last night ,there was a loud knock at the door A because B when C while D ifi was thinking about ( )when it began to rai

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I am sorry you can not take that train it( )ten minutes ago
A left B was leaving C will leave D leaves
( )i was watching tv at nine last night ,there was a loud knock at the door A because B when C while D if
i was thinking about ( )when it began to rain
A to help others B helped the others C helping the other D helping others
应该选什么 为什么 要具体说明

A C A
过去式表示已经发生
看电视是持续性动作
be thinking about doing ,others非特指