"Someone is at the door"."______?"

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问题 "Someone is at the door"."______?"

选项 A、What is it
B、Who is it
C、Who is he
D、Which one is it

答案B

解析 根据英语习惯及语法要求,someone应看作单数第三人称,指人,回答“谁”的问题。
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