【題目】It’s more than half a century ________ my grandfather joined the Party and became a servant to the people.

A. since B. that C. when D. while

【答案】A

【解析】本題考察的是since自從引導的時間狀語從句。Since自從，表示動作從過去開始，持續(xù)到現(xiàn)在，所以從句中通常使用一般過去時，前面的主句使用現(xiàn)在完成時，或者一般現(xiàn)在時。句意：自從我爺爺參軍成為人們的服務員以來已經(jīng)超過了半個世紀了。故A正確。CD兩項的語義不配。B項是強調句型，句子結構不正確。故A正確。

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