is very useful for us students English well.A、This; learnB、It; le

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问题 ______ is very useful for us students______ English well.

选项 A、This; learn
B、It; learns
C、It; to learn

答案 C

解析考查句型。It be...for sb.to do sth．是一个常用句型，其中it作形式主语，真正主语是其后的不定式to do sth。至于this，它不用作形式主语。

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______ is very useful for us students______ English well.A、This; learnB、It; le