The old man is standing ___ the head of the queue.请填入一个介词.

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• The old man is standing ___ the head of the queue.请填入一个介词.
• The old man is standing ___ the head of the queue.
• I came quite early,so I was at the _ of the queue.A.back B.middle C.head D.line
• 翻译：hopeing to be at the head of the others