题目内容：

语法综合练习36
Whom ______ Mr.Smith saw in the shopping mall the other day?
A.it was thal B.was it that C.it was who D.it was whom
请详细写出解题的过程和思路

优质解答

选B.
这是就“强调句中被强调的部分”进行提问后的句子.
假设那个人是Mary.则原来的句子为：
Mr.Smith saw Mary in the shopping mall the other day.
根据变成强调句的规则：“It is/was + 被强调部分 + that +句子剩余部分.”
则就Mary进行强调后的句子为：
It was Mary that Mr.Smith saw in the shopping mall the other day.
然后就Mary进行提问,就得到：
Whom was it that Mr.Smith saw in the shopping mall the other day?
所以选B.