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A new theory __________ before it can be put into practice.

时间:2021-07-17 18:23来源:未知作者:admin 点击: 次

(单选题)48: A new theory __________ before it can be put into practice. A: must be tested B: be tested C: can be tested D: to be tested

(单选题)48: A new theory __________ before it can be put into practice.

A: must be tested

B: be tested

C: can be tested

D: to be tested

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