20. "What can I do for you?" or "May I help you?" is a pet phrase used by _____ . A．an assistant eng...
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题目内容：
20. "What can I do for you?" or
"May I help you?" is a pet phrase used by _____ .
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A．an assistant engineer
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B．an assistant manager
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C．a helper
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D．a shop assistant
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本题链接：
