题目内容
13．Shall we go to the mountains tomorrow？OK， I am busy．（ ）
| A． | since | B． | until | C． | when | D． | unless |
分析 我们明天可以去爬山吗？可以，除非我很忙．
解答 答案：D since，自从；until，直到；when，当…的时候；unless，除非；根据答语OK和I am busy，可知"I am busy"是排除的特殊情况；用unless最适合；应选D．
点评 掌握常用的连词以及它们的区别，结合给出的语境作出正确的解答．
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