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【单选题】
对于真性牙周袋的理解，以下正患牙周炎时，结合上皮的位置向根方增殖，形成真性牙周袋确的是（）A.
牙周探诊深度（PD）≥3mm
B.
PD≥5mm
C.
只与结合上皮的位置向根方增殖有关
D.
PD≥3mm，未见结合上皮的位置向根方增殖
E.
虽有骨丧失，但上皮附着可正常
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A.
must be cleaned up
B.
must cleaned up
C.
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A.
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B.
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D.
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A.
should be
B.
must be
C.
must have been
D.
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A.
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B.
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