问题补充：
He is too tired any longer.
A. not to walk
B. to walk
C. walking
D. not walking
答案：
A. not to walk
(答案→)B. to walk
C. walking
D. not walking
解析：句意:他是如此之累,不能再走一步了.be too adj to do sth太……而不能做某事，故选B。
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