我做英语题有几道不会的,希望英语好的帮忙解答下,不算很难哦1、myreturn,ilearnedthatProfessorSmithhadbeenattheMuseumandwouldnotbebackforseveralhours.A、AtB、OnC、WithD、During答案是B,为什么不

Question

我做英语题有几道不会的,希望英语好的帮忙解答下,不算很难哦
1、____ my return,i learned that Professor Smith had been at the Museum and would not be back for several hours.
A、At
B、On
C、With
D、During

答案是B,为什么不选D?

2、There is a real possibility that these animals could be frightened,____ a sudden loud noise.
A、being there
B、should there be
C、there was
D、there having been
答案是B,为什么?

Answer 1

1选B,因为on my return 意思是“在我回来的时候”,2选B,因为：should there be 这里是对将来的虚拟语气结构,只是省略了if后将should提前了.还原的话是 if there should be a sudden loud noise.最好是不要替换,因为...