Of the 9,500 drivers ____ since the beginning of the year, 23% were found ____ in road knowledge.

A. tested; lacked                              B. testing; lacked

C. tested; lacking                            D. to test; lacking

 Of the 9,500 drivers       since the beginning of the year, 23% were found lacking road 

knowledge.

Of the 9,500 drivers ____ since the beginning of the year, 23% were found ____ in road knowledge

1. A.
   tested; lacked
2. B.
   testing; lacked
3. C.
   tested; lacking
4. D.
   to test; lacking

Of the 9,500 drivers       since the beginning of the year, 23% were found lacking in road knowledge.

A．test         B．testing         C．tested          D．were tested

Of the 9,500 drivers       since the beginning of the year, 23% were found lacking road 

   knowledge.

       A. test     B. testing C. tested  D. were tested

Of the 9,500 drivers       since the beginning of the year, 23% were found lacking road 
knowledge.