—Shelooksveryhappy.She________havepassedtheexam.—Iguess...

問題詳情：

—She looks very ________ have passed the exam.

—I guess 's not difficult after all.

A．should                          B．could

C．must                            D．might

【回答】

C　考查情態動詞。should have done意為“本應該做卻未做”；could用於對過去的否定推測，couldn't have done意為“不可能做過”；must have done表示對過去的肯定推測，意為“肯定做過……”；已經做過……”；might have done意為“可能已經做過”。上句意為：她看起來很高興。她肯定是通過了考試。故選C。

知識點：情態動詞

題型：選擇題