14．What a pity! Considering his ability and experience，he ________ better.
A．need have done B．must have done
C．can have done D．might have done
答案 D [句意：太遗憾了！鉴于他的能力和经验，他本可以做得更好。A项“本来有必要做(而没做)”；B项是对过去发生的事情的肯定的推测，表示“过去一定做了”；C项是对过去发生的事情的不肯定的推测；D项表示“本来可以”。]
15．—I wonder if I should stay until the whole thing is over.
—________．
A．It's all right B．It's nothing
C．It's kind of you D．It's up to you
答案 D [It's up to you. 表示“由你来定”。]
