Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.There have been surveys _______ in many countries to study people’s attitudes towards robots, wi
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
There have been surveys _______ in many countries to study people’s attitudes towards robots, with a particular focus on domestic use.
A. conducted
B. are conducted
C. conducting
D. which conducted