Go and wash your hands ____ once.He made a cake _____ himself.用适当的介词填空

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Go and wash your hands ____ once.He made a cake _____ himself.用适当的介词填空

Go and wash your hands at once. He made a cake for himself.

at once立刻,do sth for someone理解成为某人做某事,当然此处大意是为他自己做蛋糕

at once, by himself

at by

Go and wash your hands __at__ once. 马上去洗手,其中,at once是立刻、马上的意思;
He made a cake ___by_ himself.他自己做了个蛋糕。