A survey suggests that nearly one in six children has difficulty to talk.

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问题 A survey suggests that nearly one in six children has difficulty to talk.

选项 A、to learn
B、learning
C、learn
D、learnt

答案B

解析 本题考查have difficulty doing sth.的结构。difficulty通常用于have difficulty(in)doing sth.的结构,意为“在……方面有困难”,其中介词in可省略。
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