Question

【題目】He ______ it on schedule, but somehow he fell behind.

A. must have done B. might finish

C. could have finished D. could finish

Answer 1

【答案】C

【解析】試題分析：句意為：他本能夠按時完成任務，但他莫名其妙的落后了。must have done 對過去發生的事情的肯定推測，譯為“一定---”;might do對現在發生的事情的肯定推測，譯為“也許---”語氣不十分肯定；could have done意為“本能夠---”；could do 用于虛擬語氣，對現在或將來的事情虛擬。