Itwasreadingwuxiabooksthatcostthelittleboyplentyoftime...

问题详情：

 It was reading wuxia books that cost the little boy plenty of time that he ________ doing his  lessons.

 A. might have spent                                        B. must have spent 

 C. could have spent                                         D. should have spent

【回答】

D

知识点：虚拟语气与情态动词

题型：选择题