Select the most appropriate option to fill in the blank.
The mystery behind the extinction of the dinosaurs ______ obscure.
Show answer & explanation
Correct answer: A
Explanation
The correct answear is Option A i.e is still.
- The phrase "is still" implies that the mystery has not been solved or clarified, and it is still not clear why the dinosaurs became extinct. The other options do not fit well in this sentence:
- "Are still" does not fit because "mystery" is a singular noun and therefore requires a singular verb.
- "Be still" does not fit because it does not convey the idea of the mystery persisting over time.
- "Being still" is not a correct phrase in this context because it is in the present continuous tense and does not fit grammatically in this sentence.
Thus, the correct sentence is:
The mystery behind the extinction of the dinosaurs is still obscure.