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【单选题】
Pupils _____ will be promoted to the next grade.A.
who pass the test
B.
whom pass the test
C.
they pass the test
D.
themselves and pass the test
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【单选题】我国的视频监控系统发展了短短二十几年时间，按照技术角度为其发展排序（） ①模拟-数字视频监控系统 ②传统模拟闭路视频监控系统 ③IP视频监控系统。
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