Question

put a an the copper is _ useful metal​

Answer 1

Answer:

Though the word 'useful' starts with a vowel 'u' but its sound is that of a consonant. Therefore, this is the correct option. Hence, the correct answer is option D. Note: After implying the answer, the sentence becomes “Copper is a useful metal”.

Explanation:

Answer 2

Answer:

an is the correct answer