Bob promises to join in the football match ______ he has to help his parents on
题型：不详难度：来源：
| Bob promises to join in the football match ______ he has to help his parents on the farm. |
答案
| C |
解析
| 考查从句的连接词。句意“鲍勃答应参加足球比赛，除非他不得不要帮爸妈干农活。”A“如果”；B“当；正如”；C“除非”；D“当”。根据句意可知，用unless。故选C。 |
举一反三
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