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并列复合句
-Why didn’t you call me up last night?
-I phoned you ________ I couldn’t get through at all.
His new book will come out next month, ________ I’m eager to read it.
________ she leaves the house, or I will call the policeman.
The day must break now, ________ the birds are singing now.
Feather falls slowly ________ stone falls much faster.