Who _____ waiting outside?Please ask them to come in.详细一点,快!A.isB.hasC.haveD.are

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Who _____ waiting outside?Please ask them to come in.详细一点,快!A.isB.hasC.haveD.are

Who _____ waiting outside?Please ask them to come in.详细一点,快!A.isB.hasC.haveD.are
Who _____ waiting outside?Please ask them to come in.
详细一点,快!
A.isB.hasC.haveD.are

Who _____ waiting outside?Please ask them to come in.详细一点,快!A.isB.hasC.haveD.are
is,在主语是特殊疑问词时,谓语动词通常用三单形式,而这里面还是进行时,所以用is.

选D
应为是进行时态,所以是A或D,有因为,后文中写的them,所用复数are

who is waiting outside? please ask them to come in.
选择A。
Has是过去式的[有]。
Have是[拥有]。
而Are呢,虽然和Is的意思一样,但是和你那句句子连在一起就不顺。
所以是A——Is。