题目内容
The boys don’t know ___________.
| A．how do they swim | B．how swim |
| C．they how swim | D．how to swim |
D
解析试题分析：句意：这个男孩不知道怎么游泳。空格处是宾语部分。如果用疑问词引导的宾语从句，应用陈述句的语序，结构是：疑问词+主语+谓语动词；也可以用简单句形式，疑问词+不定式，D项正确。A项不符合陈述句语序。故选D。
考点：考查疑问词+不定式。
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