you further problems with your printer, contact your dealer for advice.

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问题 ______ you ______ further problems with your printer, contact your dealer for advice.

选项 A、If, had
B、Have, had
C、Should, have
D、In case, had

答案C

解析本句的主句使用了祈使句，而非虚拟，因此从句应理解成对真实情形的一种假设。A项使用一般过去时，是对现在或将来情况的虚拟，而if真实条件句应使用一般现在时表示将来，所以A不正确，应该使用if you have．．．；B和C都省略了if，B项have had是对过去情况的虚拟，不正确：C项中的should用在假设句中，加强语气，should have是对将来情况的假设，故C为正确答案：D项Incase“万一，以防”引导的从句使用一般现在时或should+动词原形，不能用had。

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专业英语四级

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