题目

  ——　Was that the new comer who walked by? ——　＿＿＿＿＿. A.It must be that     B.It must have been  C.He must be     D.This must have been 答案：B 解析: 表示对过去情况的猜测，用“情态动词＋have done”；而it代替上文所指的new comer。

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