摘要： -What made Jack look so worried? - his expensive and favourite ten-speed bike. A. Being lost B. Having been lost C. Losing D. To be lost [解析]选C.考查动名词作主语及省略.根据疑问词what可知.填上的部分需在句子中作主语.代替what, 而having been lost强调动作先于主句的动作发生.重在两个动作的对比.答语实际上是“Losing his expensive and favourite ten-speed bike made Jack look so worried. .

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