Often, when he something that him, he wasted his time dozing.
A. should be doing, gave
B. should have been doing, was given
C. should do, was given
D. should have been doing, had given
网友回答
A. should be doing, gave
(答案→)B. should have been doing, was given
C. should do, was given
D. should have been doing, had given
解析：根据主句他总是把时间浪费在打盹上，可知从句应为过去完成时。这里的something尾give的直接宾语，所以用被动语态，故选B，当他应该完成给他的事情时。