—She looks very happy. She ____have passed the exam.

—I guess so. It’s not difficult after all.

A. should B. could C. might D. must

D

【解析】

試題分析：考查情態(tài)動詞。本句考查情態(tài)動詞表猜測。情態(tài)動詞表猜測有以下情況：表肯定猜測用must、表否定推測用can’t、couldn’t；表可能用may、might;疑問句中表可能用can、could；表應該用should。本句中根據(jù)she looks very happy可知她看起來很開心，所以下文是很肯定的猜測，她肯定通過了考試。故選擇D。

考點：考查情態(tài)動詞

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