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18．-Have you finished your homework？
-Yes，it_______ an hour ago．（　　）

A．

did

B．

is done

C．

was done

D．

has been done

分析 -你完成家庭作業了嗎？
-是的，一小時以前完成的．

解答答案：C
根據答語中時間狀語為an hour ago可判斷句子為一般過去時，主語it代指homework是謂語動詞do的承受者，二者是被動關系，故用被動語態，所以空處為一般過去時的被動語態，其結構為was/were+及物動詞的過去分詞．又知主語it是第三人稱單數故用was，do的過去分詞為done，故選C

點評本題考查被動語態，做此類題，首先根據主語與謂語動詞的關系判斷語態，其次根據時間詞判斷時態，然后二者結合套用結構，即可選出正確答案．

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