---Wasthatthenewschoolmasterwhowalkedby?---______.A.ItmustbethatB.Itmus

发布时间：2020-08-04 17:21:55

---Was that the new school master who walked by?---______.A.It must be thatB.It must have beenC.He must beD.This must have been

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B解析选项B =It must have been the new school master who walked by.
[must + 完成时] 表对过去作肯定的推测。
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