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为什么不选A?1 The brain of an average adult is one of the largest

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为什么不选A?
1 The brain of an average adult is one of the largest organs of the body,___ about three pounds.
A.\x05weighs
B.\x05is weighted
C.\x05weighing
D.\x05to weigh it
weighing about three pounds.后缀状语用来补充说明 "the largest organ“
weighs 不可取,除非前面有代名词 it 做为后句的主词.