单项选择题
A.had never met this baby B.had spent a long time studying the baby' s illness C.visited the baby both in Deleville and London D.gave the nurse some advice on, the telephone
A.quite easy to treat B.the result of thallium poisoning C.a common one D.extraordinarily serious
A.a doctor in Deleville B.a famous doctor C.Agatha Christie D.an ordinary nurse