So far this year wea fall in house prices by 5 and 10 percentA. sawB. seeC. had seenD. ha

问题补充：

So far this year wea fall in house prices by 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：考查时态。根据时间状语So far this year，到今年为止。是现在完成时态的标志。所以选D。