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---Is_______ necessary to learn another language? --- I think so.

A．this

B．that

C．it

D．he

C

試題分析：句意：--再學另一種語言是有必要的嗎？--我認為是這樣。這里是it is+形容詞+ to do，it是形式主語，to do是真正的主語，

故選C。
考點：

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