Question

 It was playing computer games that cost the boy a lot of time that he __________ doing his lessons.

A. might have spent             B. ought to have spent

C. must have spent                  D. could have spent

 

Answer 1

【答案】

 C

根据此对话的语境，此空应是“你不可能知道，你当时正在国外读书呢”。you couldn’t have是you couldn’t have known we were friends的简略形式。该句式表示对过去有把握的否定推测。A项表示“也许知道”；B项表示 “没必要知道”；D项表示“一定知道”。均不合题意。