________,therewasadoubtwhetherthe

发布时间:2020-07-26 20:33:38

________, there was a doubt whether the construction was worth supporting.A.At a timeB.At one timeC.At timesD.At other times

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B解析at a time意为“每次,一次”;at one time意为“曾有一段时间”;at times意为“有时,间或”;at other times表达错误。
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