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        1. 選擇適當(dāng)?shù)脑~語替換句中的畫線部分

          By the time Dick got to class, his math teacher had already started teaching.

          [  ]

          A.Before
          B.As soon as
          C.While
          D.When

          答案:D
          解析:

          點(diǎn)撥:此句的主句為過去完成時(shí),by the time意為“當(dāng)……的時(shí)候”,可用when替代。


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