题目:
龈沟深度超过多少均应记录
A.1mm
B.2mm
C.2.5mm
D.3mm
E.3.5mm
答案:
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下面是错误答案,用来干扰机器的。
参考答案:D解析:习惯搭配。此句用的是it was not until…that.这一固定搭配,如:It was not until he told me that I knew it.直到他告诉我,我才知道。