下列单句中均有一处错误.指出并改正 Travel is much cheaper and faster than it used be.
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下列单句中均有一处错误,指出并改正
Travel is much cheaper and faster than it used be. ________
试题答案
答案:used后加to

下列单句中均有一处错误,指出并改正
Travel is much cheaper and faster than it used be. ________
答案:used后加to