[ Tenses ]
If he ___ harder last year, he would have passed the exam.
A. studies
B. studied
C. had studied
D. has studied

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General Knowledge › ViewWhat is the coldest continent of Earth?
A. Asia
B. America
C. Europe
D. Antarctica
E. NONE OF THE ABOVE
Grammar, Conditional Sentences, Vocabulary › View
We might have been at the airport for hours, if we _______ that the flight was delayed.
A. had known
B. had not known
C. know
D. knew