It is hoped that these new discoveries will throw ____ light upon such ____ mysterious natural phenomena.
A.
a; a
B.
a; /
C.
/; a
D.
/; /
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【简答题】A lot of research and studies have shown that Trench oil, taken out from kitchen waste, ______ the increase of cancers. A appeals to B. attends to C. contributes to D. devotes to