below the bend,the river,flowing more swiftly ,as it cuts through sand hulls covered with oine treeA.原句B.river,flowi g more swiftly,cutting C.river flows more swiftly as it cuts为什么是C?还有逗号后面的句子可以用动词ing开头吗?

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below the bend,the river,flowing more swiftly ,as it cuts through sand hulls covered with oine tree
A.原句
B.river,flowi g more swiftly,cutting
C.river flows more swiftly as it cuts
为什么是C?还有逗号后面的句子可以用动词ing开头吗?

C主句有动词.
逗号后面的句子不可以用动词ing开头,主句拖着的句子(run away sentence)
或可以
below the bend,cutting through sand hulls covered with oine tree,the river flows more swiftly.