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

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。
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