—Moreandmorepeoplethink________necessarytoletthestudentsteachthemselves

发布时间：2020-08-05 01:50:03

—More and more people think ________ necessary to let the students teach themselves．—That's true．They can improve themselves in this way．A.it hasB.itC.thatD.it does

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B解析从题中可以看出，句子缺少宾语，而后面有动词不定式，它应该是真正的宾语，前面要用一个形式宾语，只有it才能作形式宾语，所以选B。
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