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Reading the letter from her boy friend,____ A.a smile appear

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Reading the letter from her boy friend,____ A.a smile appeared on her face.B.she began to smil...
Reading the letter from her boy friend,____
A.a smile appeared on her face.B.she began to smile
应该是B,为什么A不能选?语法上有什么错?
动名词做状语,其逻辑主语要与真正的主语一致