The boy is so fat too much food and little exercise.A. as B. thatC. because D. because of

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A. as
B. that
C. because
(答案→)D. because of
解析：as 由于，随着；that以至于；because因为，接从句；because of因为，接名词性短语。由于吃太多食物而少锻炼，这个男孩是这么胖。故选D。