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

C

【解析】連詞用法。句子前半部分意思是Bob許諾要加入足球隊(duì),后面是他必須幫助他父母,因此,需要連詞“如果不,除非”。

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