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

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问题 ______ you ______ further problems with your stereo, 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 虚拟语气题。主句是祈使句,因此从句应该是对将来的虚拟,排除A;选项B不是虚拟语气,且意思解释不通,故排除;选项D,in case“以防万一”,不合句意。而在省if虚拟句中可以将should提前,变为Should+主+谓,原本语序为:If you should have further problems with your stereo,contact your dealer for advice。本句也可以不用虚拟,填if...have,但无此选项。
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