I don't really work here.I ___ until the new secretary arrives.A.just help out B.have just helped out C.am just helping out D.will just help out标准答案是C。请问为什么？
热心网友
A.just help out：一般现在时不合适 B.have just helped out：完成时不合适，完成时的时间状语不用until 选C.am just helping out： 我“正在”帮忙，“并将”帮到新秘书来到。D.will just help out ：我“现在没在”帮忙