问题
选择题
Bob promises to join in the football match _____ he has to help his parents on the farm. [ ]
A. if
B. as
C. unless
D. when
答案
答案：C
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Bob promises to join in the football match _____ he has to help his parents on the farm. [ ]
A. if
B. as
C. unless
D. when
答案：C