2. 外语
  3. ______ correct printing, envelopes should be loaded into the printer paper tray face down.

______ correct printing, envelopes should be loaded into the printer paper tray face down.

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问题 ______ correct printing, envelopes should be loaded into the printer paper tray face down.
选项 A、To ensure
B、Ensuring
C、Being ensured
D、Had been ensured
答案A
解析 语法题。to十动词原形，在此处表示目的，作状语，故选A。
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