Sometimes we might even need to spend some time _____ into a question or a request. [ ]

A. lead

B. to lead

C. leads

D. leading

以一定单位的本币为基准来计算应收或应付多少外币的汇率表示方法是()

A、直接标价法

B、间接标价法

C、美元标价法

D、欧元标价法