问题
选择题
Someone ____ my umbrella! It is all wet. And it was wet yesterday and the day before yesterday. [ ]
A. has used
B. has been using
C. used
D. is using
答案
答案：B
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Someone ____ my umbrella! It is all wet. And it was wet yesterday and the day before yesterday. [ ]
A. has used
B. has been using
C. used
D. is using
答案：B
近中面大面积银汞充填，固位力及抗力均较差，叩痛（-），无松动，牙龈组织正常。