Is the expression “what difference does that make” used generally? and what are the similar expressions?
Yes. "What difference does that make" is a pretty common expression and is used fairly frequently. "What difference does it make" is like saying these expressions: Ex: "Why are you asking this?" Ex: "Why do you need to know this?" Ex: "What is the point of this question?" Ex: "I don't understand why you are asking this.
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