However,________thisbalanceinnature

发布时间:2020-07-27 02:42:19

However,________ this balance in nature is disturbed,resulting in a number of possibly unforeseen effects.A.at a timeB.at one timeC.at timesD.some times

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C解析at a time意为“一次,每次”。at one time意为“以前,曾经”。at times意为“有时”。some times意为“几次”。
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