2. 外语
  3. ______adequate precautions are taken, there is no risk involved in the operation.

______adequate precautions are taken, there is no risk involved in the operation.

admin2014-09-24  23
问题 ______adequate precautions are taken, there is no risk involved in the operation.
选项 A、Although
B、Providing
C、Nevertheless
D、Even
答案B
解析 providing"只要"，表示条件，是从属连词，相当于provided。有时作providingthat，that可省略。
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