题目6单选题
有且仅有一个间断点的函数__________A. <img src="https://tihai-oss-cloud.itihey.com/img/8d2e3ab67b5b8abf483f3a0f0ddb873a.gif">B. <img src="https://tihai-oss-cloud.itihey.com/img/905ae261e4d287443a2fd6fa3bbad572.gif">C. <img src="https://tihai-oss-cloud.itihey.com/img/fdb3eb6ee7a33e5b137eb7d6599a8b37.gif">D. <img src="https://tihai-oss-cloud.itihey.com/img/a0699bcc93ee515487a3cd7e0558ef66.gif">