摘要：-What made Jack look so worried? - his expensive and favourite ten-speed bike. A.Being lost B.Having lost C.Losing D.To be lost

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---What made Jack look so worried?
---______ his expensive and favourite ten-speed bike．

－What made Jack look so worried?

－________ his expensive and favourite ten-speed bike．

Being lost

Having been lost

Losing

To be lost

---What made Jack look so worried?---______ his expensive and favourite ten-speed bike．