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题型：英语知识运用题类：期中考试难易度：中档
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“What are you doing?” Bruno asked in _______, although he wasn't happy to come home and find someone going through his possessions.
A. as a polite tone as he could muster B. as polite a tone as he could musterC. as polite as a tone he could muster D. a tone polite as he could muster
