14.The mats and the attached earth were lifted using the freezing technology,before        to our lab for further analysis.(  )
A.transportingB.being transported
C.to be transportedD.transported

分析 使用凍結(jié)技術,墊子和附在上面的泥土在被運送到實驗室作進一步分析之前被抬起.

解答 答案:B 考查動名詞的被動式.此處before是介詞,后接動詞時用動名詞形式,排除C、D項,且主語The mats and the attached earth與transport之間是動賓關系,要用動名詞的被動式,排除A項,只有B項正確.

點評 非謂語動詞作狀語.它的邏輯主語就是句子的主語.因此關鍵看它和句子主語之間的關系.如果是和句子主語之間構(gòu)成主動關系,使用現(xiàn)在分詞,若構(gòu)成被動關系,使用過去分詞.若表目的,使用不定式.

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