题目内容：

The little boy runs and runs until he is blue in the face.:blue in the
A.浑身发热 B.筋疲力尽 C.鼻青脸肿 D.精神焕发

优质解答

he is blue in the face
脸色发青,（气得、累得）说不出话来； 脸红脖子粗
这个本来是要表达喘气喘的厉害然后脸色发青的
这里选项B最合适
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