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 --I caught a student cheating on the exam.
   --Perhaps if he had spent as much time studying as he _____on his clothes, he would have passed!
    A. did writing    B. writing         C. had written     D. wrote

--I caught a student cheating on the exam.
--Perhaps if he had spent as much time studying as he _____on his clothes, he would have passed!
A. did writing    B. writing         C. had written     D. wrot

--I caught a student cheating on the exam.

　 --Perhaps if he had spent as much time studying as he _____on his clothes, he would have passed!

　 A. did writing　 B. writing　　　　 C. had written　　 D. wrote