问题
选择题
—— 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
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。
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