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None of the assistants were _____ when the professor needed some help.

A. available
B. accessible
C. inevitable
D. appropriate
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科目:高中英语 来源:浙江省期中题 题型:单选题

None of the assistants were _____ when the professor needed some help.
[     ]
A. available
B. accessible
C. inevitable
D. appropriate

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