The PLA man saved the boy ____ death.
A. of
B. from
C. to
D. on
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He will come ____ three days.
A. before
B. after
C. in
D. later
He went to Beijing and returned ____ three days.
A. in
B. before
C. later
D. after
He will return____ three o'clock.
A. after
B. in
C. on
D. at
He wrote the article ____ three days.
A. at
B. in
C. on
D. by