Question

Jasmine was holidaying with her family in a wildlife park ________ she was bitten on the leg by a lion．

1. A.
   when
2. B.
   while
3. C.
   since
4. D.
   once

Answer 1

A
解析：
while引導的句子中的謂語動詞為延續性動詞或狀態性動詞；
when引導的句子中的謂語動詞可為延續性或非延續性動詞．bite為非延續性動詞，when在此處為并列連詞，意為“這時”．