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None of these materials______conductors.A、isB、areC、had beenD、wereB
None of these materials______conductors.A、isB、areC、had beenD、wereB
游客
2023-11-20
61
管理
问题
None of these materials______conductors.
选项
A、is
B、are
C、had been
D、were
答案
B
解析
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