Question 13
Listen to the audio sample and answer the given subquestions.
885_640653_0_1984128_hs1001fdane1s1q11mq.mp3
“Also, Triton is one of only four objects in the solar system that we know __________ geologically active.” Fill the blank, and justify your answer
Is, because the subject of the sentence is the singular “Triton”
Are, because the subject of the sentences is “four objects” – which is in the plural
Is, because we do not know if the other three objects are geologically active yet
Are, because we know there are four objects that are geologically active