Anonymous #2 means the only engineer who designed this machine,so we should use "that" instead of "who"? No. If the antecedent is a person, you can use "who" or "that".
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Anonymous#2 means the only engineer who designed this machine,so we should use "that" instead of "who"?No. If the antecedent is a person, you can use "who" or "that". Many people prefer "who".
Anonymous1)Lee is an engineer who designed this machine.This one does not sound natural. If Lee is one of several engineers invo
Anonymous#2 means the only engineer who designed this machine?Yes.