---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(yǔ)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(yǔ),to do是真正的主語(yǔ),故選C。
考點(diǎn):
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