Bob promises to join in the football match ______ he has to help his parents on the farm. A. if B. ...
2023-02-28 07:28:48 76次 2010年山东省滨州市毕业生升学考试英语卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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
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