【題目】- What's wrong with Mary?

- She's_______ at her sister's bad behavior.

A. crazy B. nervous C. excited D. mad

【答案】D

【解析】試題分析：根據(jù)be crazy for，對…渴望；be nervous about，因…緊張；be excited about，對…興奮；be mad at對…生氣；四個短語的用法，答案應(yīng)當選D.

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