We often provide our children with toys,footballs or basketballs, that all children like these things.
A. thinking
B. think
C. to think
D. thought
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(答案→)A. thinking
B. think
C. to think
D. thought
解析：两句之间没有连词，逗号之后用非谓语动词表示。非谓语动词和主语之间是主动关系，所以用现在分词作伴随状语。句意为“我们通常给孩子一些玩具、足球或篮球，认为所有的孩子都喜欢这些东西”。