59.12_____the letter,a smile came to her facea.having readb.after readingc.readingd.while she was reading

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59.12_____the letter,a smile came to her facea.having readb.after readingc.readingd.while she was reading

59.12_____the letter,a smile came to her facea.having readb.after readingc.readingd.while she was reading
59.12
_____the letter,a smile came to her face
a.having read
b.after reading
c.reading
d.while she was reading

59.12_____the letter,a smile came to her facea.having readb.after readingc.readingd.while she was reading
D
主句的主语是smile,ABC都属于独立主格结构,主语也应该是smile,显然是she在read,而不是smile在read,所以不能选ABC;D是一个从句,有主语she,符合语法