--------left before the meeting,it doesn’t seem likely that

--------left before the meeting,it doesn't seem likely that they will come.
A In such a short time B Only such a short time C with such a short time D without such a short time.为什么选C,其他的选项为什么是错的,

选C是正确的.
此题考查with复合结构作原因状语的用法:
with+宾语(sb./sth.)+宾补(可用现分,过分,形容词,介词短语,不定式等充当)
在with such a short time left before the meeting中,such a short time 作介宾,
left 是过去分词作宾补; before the meeting作时间状语.
句意:离会议开始只剩这么短的时间,他们似乎不大可能会来.
A只能作时间状语,B是名词词组,只能作主表等成分;
而此题中不需要这些成分,因此AB不正确.
D中的虽然也可构成复合结构,但意思与此题相反,因此也不合适.