---you have any questions,pleaes contact our customer service representatives hotline.A should B could Cwould Dmight

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---you have any questions,pleaes contact our customer service representatives hotline.A should B could Cwould Dmight

---you have any questions,pleaes contact our customer service representatives hotline.A should B could Cwould Dmight
---you have any questions,pleaes contact our customer service representatives hotline.
A should B could Cwould Dmight

---you have any questions,pleaes contact our customer service representatives hotline.A should B could Cwould Dmight
A. 这是省畋句.省略了If 只能用should .提到主语you前.是虚拟语气的用法.