—— Have you found the bike you lost yesterday? —— Yes, I've found already.A. itB. thatC.

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(答案→)A. it
B. that
C. the one
D. that one
解析：代词it指代上文提到的同一事物；that指代上文提到的不可数名词或相当于the one指代上文提到的“同类事物”。本题中，it指代上文提到的the bike. 故A项正确。