Question

【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

Answer 1

【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。