Last night Li Ping watched the football match at home when he ________ his homework.

A. need have done           B. must haven done

C. should have done        D. could have worked

Last night Li Ping watched the football match at home when he ______ his homework.

1. A.
   need have done
2. B.
   must haven done
3. C.
   should have done
4. D.
   could have worked

Last night Li Ping watched the football match at home when he ________ his homework.

A. need have done           B. must haven done

C. should have done        D. could have worked

Last night Li Ping watched the football match at home when he ________ his homework.