Soru: If I ______ harder, I would have passed the exam.
A) study
B) studied
C) had studied
D) studying
Çözüm: This sentence uses the third conditional, which refers to an unreal past condition and its result. The correct structure for the 'if' clause in the third conditional is 'if + past perfect tense.' The past perfect tense is formed using 'had + past participle.' Therefore, the correct answer is "had studied."
