31.Every solid objectreflect a sound,varying according to the size and nature of the objec

发布时间:2020-08-16 06:45:53


31.Every solid object    reflect a sound,varying according to the size and nature of the object.
A. must
B. shall
C. will
D. Should

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A. must
B. shall
(答案→)C. will
D. Should
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