Question

 Marry was holidaying with her family in a wildlife park______she was bitten on the leg by a lion.
    A. while             B. when            C. before            D.after

Answer 1

【解析】B. 考查be doing----when 句型，表示“正在做某事------突然” 。when在本句中為連詞，相當(dāng)于and just then,and just at that time,意為“就在這時”。引導(dǎo)一個突然出現(xiàn)的動作。句意：瑪麗正和她的家人在野生動物園度假時，她被獅子咬傷了腿。