（福建卷）25. 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

我现在有些乱...So far this year 能说明是什么时态？

答案D。so far(到现在为止)是现在完成时的标志。
现在完成时的标志有:
1.for + 时间段；since + 时间点

　　They have lived in Beijing for five years.

　　 They have lived in Beijing since 1995.

　　I have learned English for ten years.
2.常见的不确定的时间状语：lately; recently, just, already, yet, up to now; till now; so far, these days,

　Has it stopped raining yet ?
3.在表示“最近几世纪/ 年/ 月以来……”时间状语中，谓语动词用现在完成时。

　　in the past few years/months/weeks/days；over the past few years; during the last three months; for the last few centuries, through centuries; throughout history 等

4.表示“第几次做某事，”或在 “It is the best (worst, most interesting ) +名词 ＋that” 后面跟现在完成时。

　　This is my first time that I have visited China.

　　This is the most interesting film I have ever seen.

　　That is the only book that he has written.
正如我预料的,一天下来没什么感觉,等下要去餐厅,不知道怎么收场了.