Nobody knows how long and how seriously the shakiness in the financial system will ___ down the ecoA.settle B.drag C.knock D.put

Nobody knows how long and how seriously the shakiness in the financial system will ___ down the ecoA.settle B.drag C.knock D.put
Nobody knows how long and how seriously the shakiness in the financial system will ___ down the eco
A.settle
B.drag
C.knock
D.put

Nobody knows how long and how seriously the shakiness in the financial system will ___ down the ecoA.settle B.drag C.knock D.put
选B.drag
drag down 这个词组的意思是拖垮 向下拖
整句话的意思 按单词一个一个来翻就是：
没有人知道金融体系的不稳定会把经济拖垮多久多严重!
句子的主干是the shakiness will _drag__ down the eco
in the financial system 是shakiness的定语
how long and how seriously 则是drag down的状语
至于knock down 是有降价击倒的意思 但这里的语境是拖垮 不好的影响 所以不适合用knock down

C

C