为防止产生继发龋，固定修复体设计应考虑
A、必须覆盖点隙裂沟及脆弱的牙体组织D
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Your sister _______to visit you quite ofen,didn't she?
The term CFR should be followed by _____.
Lance:Mary doesn't look well.
Lee:______.
At each of its 20 buildings at its 200-acre campus in Raleigh, North Carolina, SAS Institute provides coffee break rooms stocked with free soda, fresh fruit, M&Ms and pastries.
Do you remember the building ____ flew a red flag all the year round ?
