一个英语,我认为选B,可答案给的是A.请教高手到底选什么呢?If you had told u

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答案A.你想：你是谁?用英语怎么说.who are you
who 引导宾语从句.whom不可以 做表语的.
.宾语从句中引导词的用法在复合句中作主句的宾语,引导词有：
连词：that (that 常可省略),whether,if
代词：who,whose,what ,which
副词：when ,where,how,why 等.
======以下答案可供参考======
供参考答案1:
A