---Who'stheremakingthenoisenextdoor?---______mustbeBob.A.HeB.ItC.SheD.

发布时间:2020-08-06 12:09:41

---Who's there making the noise next door?---______ must be Bob.A.HeB.ItC.SheD.I

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B解析对于baby或没见过、未知性别的人,可用代词it.所以正确
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