:巩固练习 一、单项选择 1. The problem will appear _____ a different welfare system will be created. A. unless B. whether C. until D. if 2. The Green Corporation donated the property to the state of California, with one condition _____ the Green family would be allowed to use it when they wished. A. what B. which C. when D. that 3. —You know, I’ poor in Chinese, you are not good at English. and... —That’s _____ we should help each other. A. when B. where C. how D. what 4. Water, which seems so simple and common, is _____ makes life possible. A. what B. that C. which D. how 5. The senior three students in our school received word last week ________ some excellent students had been admitted to Peking University without taking the exam. A. that B. which C. how D. what 6. Are you certain that this is _____ in his speech? A. as Premier Wen stressed B. how Premier Wen stressed C. that Premier Wen has stressed D. what Premier Wen
