I had been looking for the book for two days ______I found it at last.
A. until
B. when
C. before
D. while
He criticized the students ________they did anything wrong.
A. However
B. whenever
C. whatever
D. whichever
No sooner had we arrived at the cinema _______the film began.
A. before
B. than
C. as soon as
D. when
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