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16.--How long do you think it is ______ she became a student teacher?
--Half a year at least.(  )
A.whenB.beforeC.thatD.since

分析 ---自从她成为了一名学生老师以来,你认为有多长时间了?
---至少半年了.

解答 答案D.因为动词became发生在过去的某个时间点,若用before,那么主句的时态就不应该使用一般现在时,故B不正确.再者became是非延续性动词,所以如果用when来引导时间状语从句的话,与前后语境矛盾,故答案A不正确.本题中的do you think是插入语,it是句子的主语,代指时间,有其自己的意义,而不能看作是强调句型或者是it做形式主语的情况,所以排除C项.since后跟句子,引导时间状语从句,句中动词应该使用一般过去时,意思是"自从…以来(时间多久了)",故答案选D.

点评 本题考查从属连词的用法.连词的用法辨析,要注意分析主从句之间的逻辑关系,再确定相应的连词,同时注意不同的连词的语义及用法区别.

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