【題目】—Who's that at the door?
is the milkman.
A.He
B.It
C.This
D.That

【答案】B
【解析】句意:——誰在門外?——是送牛奶的。因?yàn)椴恢篱T外的是什么人。故用it指代不清楚的人。故選B。

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