Rina proceeded as though she (know) everything.
knows
had known
Correct
knew
known
Explanation:
Correct Answer is: had known
সঠিক উত্তরটি হবে – had known.
– As though/ as if এর প্রথম অংশ Present Indefinite Tense এর হলে পরের অংশ Past Indefinite হয়। আবার প্রথম অংশ Past Indefinite Tense এর হলে পরের অংশ Past Perfect Tense হয়।
তাই পুরো sentence- টি হবে: Rina proceeded as though she had known everything.
Source: Advanced Learner`s English Grammar & Composition by Chowdhury & Hossain.