问题补充：
--The weather has been very hot and dry.
--Yes. If it had rained even a drop, things would be much better now! And my vegetables .
A. wouldn die
B. didn die
C. hadn died
D. wouldn have died
答案：
A. wouldn die
B. didn die
C. hadn died
(答案→)D. wouldn have died
解析：考查虚拟语气的用法：if条件句用的是had done，说明是和过去相反的虚拟，主句要用would have done，句意是：--天气一直很热很干，--是的，如果能下一滴，情况就好多了。我的蔬菜就不会死了。选D。
