题目内容
【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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题目内容
【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。