单纯性糖尿病性视网膜病变（DRP）硬性渗出（如图）最常见于（）.
A.视盘处
B.周边部
C.黄斑部
D.后极部
E.全视网膜
参考答案：D
We _________ the work on time without your help. [ ]
A. hadn't had finished
B. didn't have finished
C. couldn't have finished
D. can't have finished
国家 * * 积极干预是哪个国家工业革命的突出特点（）。
A.法国
B.美国
C.德国
D.俄国
