When ______ why he walked in without permission, he just stared at us and said nothing.

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问题 When ______ why he walked in without permission, he just stared at us and said nothing.

选项 A、asking
B、asked
C、being asked
D、to be asked

答案B

解析本题考查的是状语从句的省略。当从句的主语和主句的一样，而且谓语为be时，可以将从句的主语和谓语省略掉。就像在此题中，应该是when he was asked why…，当他被问及为什么……时……，省去he was后便是B选项。

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成人本科学位英语

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