So far this year we a fall in house prices by between 5 and 10 percent.A. sawB. seeC. had

问题补充：

So far this year we a fall in house prices by between 5 and 10 percent.

A. saw

B. see

C. had seen

D. have seen

答案：

A. saw

B. see

C. had seen

(答案→)D. have seen

解析：考查动词时态的用法。So far“迄今为止”，So far this year迄止到今年应该与现在完成时连用。