The cues that trigger laughter have been studied by scientist.
举一反三
- By the end of last term we ___ English for two years. A: have studied B: have been studied C: would studied D: had studied
- Many a young scientist ________ engaged in the research work. A: have B: has C: have been D: has been
- Which topics in the following choices have been studied by Fyodor Dostoevsky?
- It is not the tools a scientist uses but how he uses them that_____ him a scientist.
- 中国大学MOOC: What factors that influence languages have been studied by language researchers？