题目内容
They learned it all by themselves. That is to say nobody told them ________ .
| A．what to do it | B．how to do it | C．where to do | D．when to do |
B
解析试题分析：句意：他们是自学的这些技能。也就是说没有人告诉他们该如何去做这些事。本句考查特殊疑问词+to do做宾语；A项中it多余；C和D项少了it；结合句意可知，B项符合要求；故选B。
考点：考查特殊疑问词+不定式。
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