Before____ the receipt, please check that the consignment is com

Before____ the receipt, please check that the consignment is complete and undamaged.
A、signed
B、signing
C、sign
D、you signed
【正确答案】：B
【题目解析】：【考点点击】本题主要考查的知识点为签收单据的表达。【要点透析】before在句中为介词，其后接动词的-ing形式。beforesigningthereceipt表示“在签收据之前”。故选B项。