A mother will arrive at the discovery, either instinctively or by an unconscious series of trials and errors, that her baby is m

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问题 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.

选项 A、holding
B、held
C、having held
D、being held

答案B

解析 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having held。being held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。
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