Ten minutes_____an hour when one is waiting for a phone call.

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Ten minutes_____an hour when one is waiting for a phone call.
Ten minutes_____an hour when one is waiting for a phone call.

Ten minutes_____an hour when one is waiting for a phone call.
Ten minutes __seems___ an hour when one is waiting for a phone call.
复数名词或短语表示时间、价格、数字、度量衡等时,它们表示单一的概念,其谓语动词用单数形式.