We all agree that good knowledge of physics is a must in explaining such natural phenome

发布时间：2020-08-16 08:49:30

We all agree that      good knowledge of physics is a must in explaining such      natural phenomena.
A. a; /
B. a; a
C. /; a
D. /; /

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(答案→)A. a; /
B. a; a
C. /; a
D. /; /
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