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Is______necessary to change trains at Beijing?

          A. this      B. that      C. it      D. he

C


解析:

不定式、动名词作主语时常用形式主语it来代替,而把真正的主语──不定式和动名词后置。常住it作形式主语的动名词结构有:It’s no use (no good, no point) doing sth. It’s a waste of time doing sth.等。故本题选C。又如:It was no good quarrelling again.

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