Correct Answer:
Option B - ‘has’ indicates present tense and in passive voice present perfect (have been) would be used here. The gallery has over 1000 paintings. These have been collected during the last 100 years. Hence option (b).
B. ‘has’ indicates present tense and in passive voice present perfect (have been) would be used here. The gallery has over 1000 paintings. These have been collected during the last 100 years. Hence option (b).