The Gadfly was too much exhausted to wake easily ______.

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问题 The Gadfly was too much exhausted to wake easily ______.

选项 A、when once asleep
B、as once asleep
C、while once sleeping
D、when once sleeping

答案A

解析 状语从句中的谓语动词是be,而主语又与主句中的主语相同时,或者从句的主语是it,可以省略从句中的动词be和主语,否则,不可省略。本句从句的主语和主句主语相同,而且谓语动词是be, asleep作表语。因此,可将主语和be省略。
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