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

问题补充：

—— Have you found the bike you lost yesterday?

—— Yes, Ive found already.

A. it

B. that

C. the one

D. that one

答案：

(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。