Alaska regularly deposits some of its profits from the sale of oil into a special fund, with the intention to sustain the state’s economy after the exhaustion of its oil reserves.
A.fund, with the intention to sustain the state’s economy after the exhaustion of its oil reserves
B.fund, the intention of which is to sustain the state’s economy after they have exhausted their oil reserves
C.fund intended to sustain the state’s economy after oil reserves are exhausted
D.fund intended to sustain the state’s economy after exhausting its oil reserves
E. fund that they intend to sustain the state’s economy after oil reserves are exhausted
答案为C
ABE可排除~~D选项，答案解释说因为Alaska后面不能接exhaust，但查了字典以后，当exhaust用作“耗尽，用完”时，是有这样的用法的~~请问nn这里的D选项错在哪里？是因为its的指代问题吗？还有C选项用了被动语态，是不是不好？ | 
