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

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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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