In some cases,different approaches ________ the same scientific problem lead to conflicting theories.
#26775
A
to
B
in
C
of
D
for
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 There is no greater love than ________ who devotes his whole life ________  mankind. 
#28579
A
that of a man; to benefiting
B
a man; to benefiting
C
that of a man’s; benefits
D
a man’s love; in benefiting