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        1. —Why didn’t you go to school yesterday?
          —______ my mother was in hospital and I had to take care of her.
          A. Then       B. Because      C. If

          B

          解析試題分析:Then那么,然后;Because因為;If是否,如果。句意:昨天你為什么沒有去上學?——因為我的母親生病住院了,我不得不照顧她。結合語境可知選B。
          考點:考查連詞辨析

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