I——(lose) my bike.I've to buy a new one.

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I——(lose) my bike.I've to buy a new one.

I——(lose) my bike.I've to buy a new one.
I——(lose) my bike.I've to buy a new one.

I——(lose) my bike.I've to buy a new one.
have lost

可以只用过去时lost 就ok了。书丢了,发生在过去,所以就可以用过去时,当然也可以用完成时,看你想表达一个什么样的语境。希望对你有帮助。