Question 1:
C. Had you listened to my advice
This is the correct form for a third conditional sentence (past unreal situation).
Question 2:
A. does he know
This is an example of inversion for emphasis, typically used with words like "little," "never," etc.
Question 3:
C. No sooner
This is an inverted structure used with "No sooner" to indicate that something happened immediately after another event.
Question 4:
B. Seldom do
This is a correct inversion with "seldom," which is used to emphasize the frequency of an event happening rarely.
Question 5:
B. that she remembered
This is the correct structure for sentences starting with "It was not until..." followed by the clause "that."
Question 6:
D. Had he studied harder last year
This is the correct form for a third conditional sentence (past unreal situation), using inversion.
Question 7:
D. Only by working hard
This is a correct structure for sentences emphasizing the condition under which something will happen.
Question 8:
A. No sooner
This is the correct inversion for "No sooner" used to indicate a quick succession of events.