Q560
The quality of products . . . . . . . . over time.
A.
are degrading
B.
have been degrading
AnswerC.
have degrading
D.
were degraded
Answer: Option B
Solution
Answer: Option B
Solution:
We would use 'have been' when the sentence subject is I, you, we, or the third person plural (the children have been studying grammar all morning; they have been studying all morning). If the sentence subject is a third-person singular noun (he, she, it, Courtney), we would use the phrase 'has been'.