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        1. ---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(rèn)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(diǎn):
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