【单选题】【消耗次数：1】
当图所示的虚线框内为______时，可以实现D触发器转换为T触发器。<imgwidth="210"height="120"src="http://wljy.whut.edu.cn:80/uploadfiles/word/szlj04.files/szlj044402.png">
①
异或门
②
同或门
③
或非门
④
与非门
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