—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(dòng)詞。本句考查情態(tài)動(dòng)詞表猜測(cè)。情態(tài)動(dòng)詞表猜測(cè)有以下情況：表肯定猜測(cè)用must、表否定推測(cè)用can’t、couldn’t；表可能用may、might;疑問(wèn)句中表可能用can、could；表應(yīng)該用should。本句中根據(jù)she looks very happy可知她看起來(lái)很開(kāi)心，所以下文是很肯定的猜測(cè)，她肯定通過(guò)了考試。故選擇D。

考點(diǎn)：考查情態(tài)動(dòng)詞

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