Contact me at once _______ any problem.

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问题 Contact me at once _______ any problem.

选项 A、you should have
B、have you
C、should you have
D、you have

答案C

解析 此题考查虚拟语气。不出现if的情况下,should在虚拟句中提前,句子倒装,意思是“万一,要是…的话”。主句是祈使句时,此种句式比较常用。
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