I have already given instructions for the task to be taken up first and the engineers doing the job to work overtime.

【正确答案】 A

【答案解析】本题的关键在于把握instructions，be taken up，first和work overtime的意思。instructions意为“命令，指示”，be taken up意为“被承担”，first此处可翻译为“首先”，work overtime可翻译成“加班工作”。