27.
Your Answer is
Correct Answer is B
Explanation
Sentence subject: Astronomers, predicate: know, that guides the object clause, and the main sentence cannot be separated by commas, so item B is correct.
27.
Your Answer is
Correct Answer is B
Explanation
Sentence subject: Astronomers, predicate: know, that guides the object clause, and the main sentence cannot be separated by commas, so item B is correct.