问题
选择题
It is hoped that these new discoveries will throw ____ light upon such ____ mysterious natural phenomena.
A．a; a
B．a; /
C．/; a
D．/; /
答案
答案：D
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It is hoped that these new discoveries will throw ____ light upon such ____ mysterious natural phenomena.
A．a; a
B．a; /
C．/; a
D．/; /
答案：D