Itwasreadingwuxiabooksthatcostthelittleboyplentyoftime...

問題詳情：

 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

知識點：虛擬語氣與情態動詞

題型：選擇題