In order to make learners master this skill easily, you should introduce clearly______they need to know.

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问题 In order to make learners master this skill easily, you should introduce clearly______they need to know.

选项 A、that
B、what
C、who
D、which

答案B

解析考查宾语从句。动词introduce后接宾语从句，从句中缺少宾语。that引导宾语从句时不充当句子成分；who指人；which引导宾语从句时表疑问含义“哪一个”，此句中并非疑问含义，而是用what引导从句表陈述含义，意为“介绍清楚他们所需要知道的内容”。故选B。

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中学英语

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