__ you _ further problems with your printer, con

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________ you _______ further problems with your printer, contact your dealer
选择题____ you_____ further problems with your printer,contact your dealer for advice.
A.If,had B.Have,had C.Should,have D.In case,had
说明答案和理由重点请讲解为啥不选除去should/have以外的选项

如果A是对的话,contact your dealer for advice.这句应该有主语,但是他没有主语,所以A错
如果B是对的话,contact your dealer for advice.这句应该有主语,但是他没有主语,所以B错
C是正确的,因为这句是一句典型的句型.之后是没有主语的.例如.
Should you have any problem,please feel free to contact me. 再答：不用客气^^

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