题目

---______ one and a half days enough for the painting to be finished? ---That's enough. The painter is ill and only after ______ go with it. A. Are; he recovers can he              B. Are; he recovers he can C. Is; he recovers can he                  D. Is; he recovers he can   答案：C只用一种试剂就能将KCl、FeCl3、AlCl3三种溶液区分开，这种试剂是（　　）A．HClB．NaOHC．H2SO4D．BaCl2