______you are no doubt aware, the new security system requires the installation of a backup power source in case an emergency si

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问题 ______you are no doubt aware, the new security system requires the installation of a backup power source in case an emergency situation arises.

选项 A、As
B、For
C、With
D、So

答案A

解析分句you are no doubt aware是主系表结构，结构完整，横线处应填入引导状语从句的从属连词。答案是(A)as。

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