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【题目】Bob promises to join in the football match ______ he has to help his parents on the farm.

A. if B. as C. unless

【答案】C

【解析】句意:鲍勃承诺参加足球比赛除非他必须在农场帮助他父母。if 如果;as当;unless除非、如果不。所以选C。

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