Question

英语虚拟语气选择题应该怎么选择时态

i can't stand him.he always talks as though he __everything
A knew B knows C has known D had known
总是区分不开什么时候应该用过去时什么时候应该用过去完成是，求详解，十分感谢。。
i would have told him the answer had it been possible ，but i __so busy then。
A had been
B were
C was
Dwould be
不知道应该怎样

Answer 1

如何区分，主要看是对现在还是过去事实的假设。对现在用过去，过去用过去完成时。

Answer 2

A C

我到不是像上面前面去思考的，第一句就是一种告知，过去式
第二题一样，所以还是用一般过去时。

Answer 3

A; 2题： Had it been possible ,I would have told him ,but I was so busy then. 前面是虚拟语气，和过去相反的虚拟，而后面是当时的真实情况。

Answer 4

主句would have told 过去式，but事实选were

Answer 5

建议百科。。。。。。