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        1. – May I play basketball with my friends now?
          – No, ______ you’ve finished your homework.
          A. since                        B. if                    C. unless

          C

          解析試題分析: 句意:我可以現(xiàn)在和我的朋友踢足球嗎?不行,除非你已經(jīng)完成了作業(yè)。Since自從if如果unless
          除非。完成作業(yè)是踢足球的條件故選C。
          考點(diǎn): 考查連詞。

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