Icouldn'tgetthrough;someone________thetelephone.A.maybeusingB.mayhave

发布时间：2020-08-04 19:07:02

I couldn't get through; someone ________ the telephone.A.may be usingB.may have usedC.must have been usingD.must be using

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C解析因为一直占线，所以是有人一直在用电话因为一直占线，所以是有人一直在用电话。
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