【题目】Peter used to _____ (is) shy, but now he is outgoing.
【答案】be
【解析】
句意：彼得过去很内向，但是现在他变活泼了。这里是固定搭配used to do“过去常常做某事”，这里跟动词原形，用be正确。故答案为be。
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