[单选题]6.她口角边渐渐的有了笑影，脸上也白胖了。( )
ALittle by little the trace of a smile appeared at the corners of her mouth, but her face became whiter plumper.
BLittle by little the trace of a smile appeared at the corners of her mouth, so her face became whiter plumper.
CLittle by little the trace of a smile appeared at the corners of her mouth, while her face became whiter plumper.
DLittle by little the trace of a smile appeared at the corners of her mouth, when her face became whiter plumper.
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