A mother will arrive at the discovery either instinctively or by an unconscious series of
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A mother will arrive at the discovery, either instinctively or by an unconscious series of trials and errors, that her baby is more at peace if______on the left against her heart than on the right.
A．holding
B．held
C．having held
D．being held
请帮忙给出正确答案和分析，谢谢！
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正确答案：B
句中that从句是discovery的同位语，if从句又是该同位语从句中的子从句，其逻辑主语是baby，与hold动作是被动关系"被抱着"，所以应该用被动形式，排除hold—ing和havingheld。beingheld之所以错，是因为if从句是省略结构，按规则，be动词也应一并省去。