Question

一道英语选择题

_______before we depart the day after tomorrow,we should have a wonderful dinner party.
A,Had they arrived,
B,Would they arrive
C,Were they arriving
D,Were they to arrive
知答者还望附上原因

Answer 1

选D。这是个虚拟语气。虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略，再把were, should或had 移到从句句首，实行倒装。
在虚拟语气的从句中，动词'be'的过去时态一律用"were"，不用was， 即在从句中be用were代替。
从后面的should可以看出来了，这句话表示的是未来的虚拟语气，所以选A是不正确的。选A后面应该用should have done的形式。只能选D。

Answer 2

选D，虚拟语气中的当条件句中谓语动词含有were,had,should是可以将if省略，将were,had,should移至主语前面。且从整个语句语义看，这是一表将来意义的条件句的虚拟语气。
原句应该是if they were to arrive before we……所以应该选D。我记得这是某一年四级考试但选的最后一道，或者倒数第二道题。

Answer 3

C
如果此句不用虚拟语气（须倒装）的话，应该是这样的：If they were arriving before we depart the day after tomorrow, we should have a wonderful dinner party.所以倒装后应为Were they arriving before we depart the day after tomorrow, we shoudl have a wonderful dinner party.

Answer 4

C

Answer 5

a is the correct answer.