5.________ with some research materials,he decided on three possible approaches in his experiment.( 。
A.PreparingB.PreparedC.Having preparedD.Prepare

分析 準備好了一些研究材料,在他的實驗中,他選定了三種可能的方法.

解答 答案:B
此處在句中作狀語,盡管動詞prepare與其邏輯主語he之間是主動關系,但是由于此處的過去分詞prepared來源于系表結構be prepared with"準備好",故此應使用過去分詞形式,故選B.

點評 做本題時,需要了解有些過去分詞因來源于系表結構,作狀語時不表被動而表主動;這樣的過去分詞及短語常見的有:lost (迷路); seated (坐); hidden (躲); stationed (駐扎); lost/absorbed in (沉溺于); born (出身于); dressed in (穿著); tired of (厭煩)等.

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