题目内容
2．Mary missed the picnic yesterday __________ she had to look after her sick mother．（ ）| A． | unless | B． | though | C． | because |
分析 Mary错过了昨天的野餐，因为她必须照顾她生病的妈妈．
解答 答案：C；
根据语境以及上下文，本题考查的是连词的用法．根据设空处前后句的句意"Mary错过了昨天的野餐"和"她必须照顾她生病的妈妈．"，可知后面一句表达是前面一句的原因，所以用连词because引导原因状语从句；故选C．
点评 本题主要考查连词的用法，做此类题目一定要弄清句意，明白上下文之间的关系，才能更好地判断出所要用的连词．
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