〓英语〓一道选择题〓小诺求助〓It is necessary ______ to learn the language
9个回答
C
选A的话你是把它看成是从句了,但从句中没有主语
其实It是形式主语后面的to do不定式是真正的主语 而for them 就是 to do 不定式的逻辑主语是不定式的复合结构
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