Avoid a child into the parental bed, or this can become a fixed habit.A. to takeB. to be t

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A. to take
B. to be taken
(答案→)C. taking
D. being taken
解析：句意:不要把孩子去父母的床上睡，要不然的话就是一个固定规律了。这里avoid+doing，因为空格后有宾语a child,所以take有宾语，就不能用被动，故选C。