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1£®A subway is an effective way to solve traffic problems in        big city. It has evident advantages, such as        speed and convenience.

       A£®the; the               B£®a; the                  C£®a; /                     D£®the; a

2£®--- Why were you absent yesterday?

   --- I caught a cold,      I had been walking around in the rain.

       A£®but                     B£®so                       C£®and                     D£®for