in decades to come 还是in decades coming,

问题描述:

in decades to come 还是in decades coming,
if the amount of water decreases in decades_____,water problem will be huge.
A.to come B.coming
请问选什么啊,为什么,怎么觉得这两个差不多啊

A.to come
因为这个问题还没有到来,所以应该用to come表示动作未发生