There have been ten thousand visitors to the exhibition since ____.

There have been ten thousand visitors to the exhibition since ____.A. its openingB. it’s openingC. it opensD. one monththe key is Awhy not c

热心网友

since 既可以是介词，也可以是连词，都表示时间上的点，展览会自开幕以来，已经有10000人来参观。开幕是时间的点，B，C，D都不是表示时间的点，而是时间的段。如果改成这样，There have been ten thousand visitors to the exhibition since one month ago.也是对的

热心网友

如果用 D ，opens 因该改为 opened，它是过去发生的事情了