He was overcome by the fear ______ he had lung cancer.
A. which
B. what
C. that
D. of
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If they don’t understand it the first time, go over it again ______ they do.
A. when
B. after
C. since
D. until
He found at last ______ he had been looking for.
A. that
B. what
C. where
D. which
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