________ you _______ further problems with your printer, contact your dealer

题目

________ 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

答案