Millions of tons of water are______by a complex system of dykes.

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问题 Millions of tons of water are______by a complex system of dykes.

选项 A、held up
B、held on
C、held out
D、held back

答案D

解析 本题是说数百万个水离子被一种复杂的沟渠系统阻挡住了。D项“hold back”阻挡;阻止……的发展;隐瞒(秘密);踌躇,畏缩不前(如His poor education is holding him back.The police held backthe crowd.He was holding something back from us.No one held back in face of danger.),符合题意。其他三项中,hold up“举起;支撑;使停顿,使不能继续进行;(拦路)抢劫”;hold on(单独用)“握住不放,坚持下去,(电话)请等一会儿”;hold out(单独用)“伸出;坚持(要求),不屈服(forsth)”,都不符合题意。
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