问题
选择题
The old man needs at most five hours' sleep a night, but he _______ for over seven hours tonight. [ ]
A. has gone to bed
B. has slept
C. has gone to sleep
D. has fallen asleep
答案
答案：B
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缺失，5年前曾在诊所行
单端固定桥修复，现诉：
松动疼痛检查，
近中邻面龋坏，探（+），造成龋坏的主要原因（）