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        1. 16.[1994全國] Don't all speak at once! ________ , please.

          A. Each at one time

          B. One by one time

          C. One for each time

          D. One at a time

           

          答案:D
          提示:

          題目考查習(xí)慣說法。One at a time:一次一人

           


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