单项选择题

It was an uphill work, we have to discuss it beforehand.（）

A．由于这是一件上山的工作，我们应该先商量。
B．因为这件事情办起来很困难，我们得事先讨论一下。
C．既然这件工作就是爬山，我们先干然后讨论。
D．当办这件事很费力时，我们就得先讨论如何办。

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