A subject which seems not yet______by doctors and psychologists is the influence of geography and climate on the psychological and physical health of mankind.
A. to have been studied
B. to be studied
C. having been studied
D. being studied
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狗的尾巴还能表达感情呢。它一见主人，尾巴就会yao个不停。
These differences should not hinder us from establishing normal state relations; still less______war.
A. they should lead to
B. leading to
C. lead to
D. should they lead to
You______ more patient with that customer; I am sure that selling him the watch was a possibility.
A. should have been
B. should be
C. must be
D. needed to be
患疱疹性口腔炎的患儿
A. 哺乳前后用2％碳酸氢钠溶液清洁口腔
B. 鼓励多饮水，进食前后用2％碳酸氢钠溶液漱口
C. 局部使用锡类散.冰硼散涂抹患处
D. 选用有效抗生素控制细菌感染
E. 随时使用2％利多卡因涂局部止痛
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