上前牙缺失的深覆患者，固位体可以设计为3／4冠。
参考答案：对
---yes, _______.We’d better buy some.
A. run out of; we have run it out
B. run out of; our food has run out
C. run out of; out food has been run out
D. run out; our food has run out
系统分析不能解决的问题有哪些？
