---Is_______ necessary to learn another language?      --- I think so.
A．thisB．thatC．itD．he
C

試題分析：句意：--再學(xué)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。
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