The new system should be tried out first _______ it is put into use.A. beforeB. - 初中英语试题 - 超级试练试题库

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题型：0110 模拟题难度：来源：

The new system should be tried out first _______ it is put into use.A. before
B. after
C. when
D. while

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试题【The new system should be tried out first _______ it is put into use.A. beforeB. 】；主要考察你对从属连词等知识点的理解。[详细]

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C. but
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