"I don't feel happy," Mr. Zhang quoted Xiaoming as saying; as if in stilted English.
as if in stilted English= as if he (指Xiaoming)was saying in stilted English.
注意这个方式状语从句不是修饰谓语动词quoted,而是修饰动名词saying。所以as if从句的主语是Xiaoming,而不是Mr. Zhang.
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