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        1. -Be careful! You might fall into the water.
          -Thank you. I____.I______ so close to the pool.
          A.didn't know; am standing
          B.don't know; am standing
          C.didn’t know; was standing
          D.didn't know;Would stand
          C
          根據(jù)下文內(nèi)容可知是之前沒注意,用過去時,根據(jù)上下文的內(nèi)容可知答案為C
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