It is your own faultyou are so tired. You oughtn’t to have stayed up so late.A. whenB. how

问题补充：

It is your own faultyou are so tired. You oughtn’t to have stayed up so late.

A. when

B. how

C. where

D. why

答案：

A. when

B. how

C. where

(答案→)D. why

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