7. I felt surprised that anyone of his intelligence    such an easy test. 

A. might have failed      B.  could have failed

 C.  should have failed     D. must have failed

7.    C考查情態(tài)動詞。句意：我感到很驚訝，他這樣聰明的人竟然沒通過如此簡單的測試。由surprised看出本句表示驚訝。should表示驚訝，意為"居然，竟然"，從而確定C項(xiàng)正確�！就卣寡由臁恳话阏f來，"情態(tài)動詞+ have done"應(yīng)從兩方面考慮含義. 

(1)   "對過^情況的猜測（如musL have done"肯定做過了……"）

(2)   與過去事實(shí)相反（如should have done"本該做而實(shí)際上未做"） 但本題的A、B選項(xiàng)比較特別，試比較：

He might/could have passed, but he was too nervous.

他本可以/本能夠通過的，可是他當(dāng)時太緊張了。

He might/could have passed, but I haven't seen him.

他可能已經(jīng)通過了，但我還沒見到他呢。（言下之意，只是猜測而已）

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練25 情態(tài)動詞和虛擬語氣

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