—Who’s that at the door?
—          is the milkman.
A．HeB．ItC．This D．That
B

試題分析：考查代詞的用法。句意：——誰在門外？——是送牛奶的。因為不知道門外的是什么人。故用it指代不清楚的人。故選B。
【知識拓展】it 的用法
it 詞小本事大， 人稱代詞包括它； 不明身份和性別，模糊指代就用它；距離日期和時間，天氣環(huán)境全靠它；形賓形主慣用法，強調(diào)句型它當家。
1)指代姓別不明的人
Look at the baby.Isn’t it lovely?
2)指天氣、時間、距離、自然現(xiàn)象、環(huán)境等。
It’s twenty miles to the zoo.
3)作形式主語或形式賓語代替不定式、動名詞、名詞性從句。
It’s of great help to learn English well.
I find it quite necessary to make some changes.
4)特殊的形式賓語it。enjoy, like, dislike, love, hate, prefer, appreciate等表示“喜歡、恨”等心理方面的動詞后接if 從句或when 從句，通常應(yīng)先在動詞后接it 作形式賓語。如：
I will appreciate it if you can give me a hand.
5)用于強調(diào)句中：It is／was…that／who。
It’s from the sun that we get light and heat.
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