20．He was admitted to our school two years ago，a top school in our hometown，_____ he has been crazy about reading electronic novels，killing time．（　�。�
A．after thatB．since thatC．after whenD．since when

分析 兩年前他被我們學校--我們家鄉(xiāng)的一所重點學校錄取了，從此以后，他一直沉迷于看電子小說來消磨時光．

解答 答案選D
"…h(huán)e has been crazy about reading electronic novels，killing time"是非限定性定語從句，先行詞是two years ago，所以要用關(guān)系副詞when代指two years ago這一時間點；since+時間點，用于現(xiàn)在完成時態(tài)，故選D．

點評 本句考查的是非限定性的定語從句，主句與從句通常用逗號隔開．句中"a top school in our hometown"作our school 的同位語．two years ago是先行詞，在從句中與作since一起作時間狀語，從句使用現(xiàn)在完成時．

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