中国大学MOOC: Ever since the first nuclear power stations were built ,doubts have ______about their safety.
举一反三
- Ever since the first nuclear power stations were built, doubts have _____ about their safety. A: preserved B: traces C: tracks D: trails
- Ever since the first nuclear power stations were built, doubts have ______ about their safety. A: suspended B: survived C: lingered D: D．preserved
- Ever since the first nuclear power stations were built, doubts have ________ about their safety. A: A preserved B: B survived C: C suspended D: D lingered
- Since the Chernobyl nuclear explosion the public ____ great concern over the safety of nuclear power plants.
- A lot of buildings ______ and the place ______ very noisy ever since we moved here. A: have been built; has become B: have been built; became C: were built; has become D: were built; became