The river have , so they will have to spend much money irrigating(灌溉) the crops.
A. gone up
B. built up
C. broken up
D. dried up
网友回答
A. gone up
B. built up
C. broken up
(答案→)D. dried up
解析：
试题分析:句意：河流已经干涸了，所以他们将不得不花钱去灌溉庄稼。go up上升；build up积聚；break up分解；dry up 干枯。根据so后面的结果判断选D。