During the first two months of a baby’s life, the stimulus that produce a smile

游客2023-12-01  18

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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