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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 ---自從她成為了一名學生老師以來，你認為有多長時間了？
---至少半年了．

解答 答案D．因為動詞became發(fā)生在過去的某個時間點，若用before，那么主句的時態(tài)就不應該使用一般現(xiàn)在時，故B不正確．再者became是非延續(xù)性動詞，所以如果用when來引導時間狀語從句的話，與前后語境矛盾，故答案A不正確．本題中的do you think是插入語，it是句子的主語，代指時間，有其自己的意義，而不能看作是強調句型或者是it做形式主語的情況，所以排除C項．since后跟句子，引導時間狀語從句，句中動詞應該使用一般過去時，意思是"自從…以來（時間多久了）"，故答案選D．

點評 本題考查從屬連詞的用法．連詞的用法辨析，要注意分析主從句之間的邏輯關系，再確定相應的連詞，同時注意不同的連詞的語義及用法區(qū)別．

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