问题补充：
The little boy is very fateating too much food.
A. so
B. so of
C. because
D. because of
答案：
A. so
B. so of
C. because
(答案→)D. because of
解析：句意；这个小男孩非常胖是因为吃得多。so形容词，如此，这样的+形容词/副词。because连词,+句子。because of因为+名词/名词性短语/动名词。故选D.
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