单项选择题
A．business;invoice;contract B．foreign;trade contract;invoice C．business;LC;contract D．foreign trade;invoice;contract
A．What a …on B．What…in C．How..in D．What a …in
A．plastic drum;gunny bag;wooden case B．wooden case;plastic drum;gunny bag C．wooden case;gunny bag;plastic drum D．plastic drum;wooden case;gunny bag