---Jackfellofftheladderyesterday,butheisallrightnow.---...

問題詳情：

--- Jack fell off the ladder yesterday, but he is all right now.

---What a lucky dog! He _______ himself badly.

A． could injure               B． must have injured

C． should injure             D． might have injured

【回答】

D

知識點：虛擬語氣與情態動詞

題型：選擇題