15.
Your Answer is
Correct Answer is D
Explanation
Before the underlined part is a subordinate clause guided by when, and the main clause must be behind it, so no conjunctions can appear in the underlined part. D is correct.
15.
Your Answer is
Correct Answer is D
Explanation
Before the underlined part is a subordinate clause guided by when, and the main clause must be behind it, so no conjunctions can appear in the underlined part. D is correct.