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  3. During the first two months of a baby’s life, the stimulus that produce a smile is a pair of eyes, which need not be real—a mask

During the first two months of a baby’s life, the stimulus that produce a smile is a pair of eyes, which need not be real—a mask

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问题 During the first two months of a baby’s life, the stimulus that produce a smile is a pair of eyes, which need not be real—a mask with two dots will produce a smile.
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答案主谓不一致，应把produce改为produces。
解析 that引导的定语从句修饰先行词stimulus，这个词看似复数形式，其实是单数，表示“刺激，刺激物”，其复数形式为stimuli，因此从句的谓语应该使用单数形式。
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