-- Was that the new comer who walked by? -- ＿＿＿＿＿A.It must be thatB.It must have
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—— 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
试题答案
B
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。