Question

The teacher asked the students ...... they had seen the exhibition.

• A. that
• B. but
• C. until
• D. if

Answer 1

Answer:

D. if

• That: This is used to introduce a clause, but not typically used for reported yes/no questions.
• But: This is a conjunction used to contrast statements and does not fit this context.
• Until: This is used to indicate a time period and is not appropriate here.
• If: This is used to introduce a reported yes/no question, which is the correct context here.