Often, when he ______ something that ______ him, he wasted his time drawing some little pictures.

A. should be doing; gave

B. should have been doing; was given

C. should do; was given

D. should have been doing; had given

Often, when he ______ something that ______ him, he wasted his time drawing some little pictures.

1. A.
   should be doing; gave
2. B.
   should have been doing; was given
3. C.
   should do; was given
4. D.
   should have been doing; had given

Often, when he            something that            him, he wasted his time drawing little pictures.

       A．should be doing, gave     B．should have been doing, was given

       C．should do, was given       D．should have been doing, had given