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

A. available
B. accessible
C. inevitable
D. appropriate
A
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科目：高中英語(yǔ) 來(lái)源：浙江省期中題 題型：單選題

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

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