11．Students taking the course _____to finish their homework with the help of computers．（　�。�
A．are encouragedB．have encouraged
C．are encouragingD．had been encouraged

分析 鼓勵選擇這門課程的學生在電腦的幫助下完成家庭作業(yè)．

解答 答案是A．本題考查被動語態(tài)．taking the course是現(xiàn)在分詞答語作后置定語，Students和encourage是動賓關系，應該用被動語態(tài)，排除B、C；D項是過去完成時的被動語態(tài)，表示的是"過去的過去"，但是句中不存在過去的過去，不能用過去完成時．故選A．

點評 本題考查被動語態(tài)，要分析主語和動詞之間的關系，聯(lián)系動詞本身的特定用法；在掌握被動結構的基本形式"be/get+過去分詞"的基礎上理解不同時態(tài)的被動語態(tài)的結構，最后進行綜合判斷．

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