Of the 9,500 drivers ____ since the beginning of the year, 23% were found ____ in road knowledge.
A．tested; lackedB．testing; lacked
C．tested; lackingD．to test; lacking
C

試題分析：考查非謂語動詞：句意：在今年年初以來被檢測的9500個司機(jī)中，23%被發(fā)現(xiàn)缺乏公路知識。第一空做后置定語，修飾drivers，因為drivers和test是被動關(guān)系，用過去分詞做定語，第二空是主語補足語，主語是the drivers和lack是主動關(guān)系，用現(xiàn)在分詞做補足語，選C。
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