1.Theworld（）inthepastseveraldecadesintoonewhereknowledgeisnowtheengineforsocio-economicdevelopment.A.transformedB.hastransformedC.hasbeentransformedD.hadbeentransformed2.Teachersknowthatstudentsdifferinhowtheyle

Question

1.The world （ ）in the past several decades into one where knowledge is now the engine for socio-economic development.
A.transformed B.has transformed C.has been transformed D.had been transformed
2.Teachers know that students differ in how they learn,（ ）their backgrounds,experiences and natural ability.
A.depends on B.depended on C.depending on D.to depend on

Answer 1

1.C
在过去几十年里,这个世界被转化成为这样一个世界即,在那里,知识成为社会经济发展的发动机.这里,世界不能自己转化,当用“被动语态”,排除A,B.句子中有"knowledge is now"什么什么,可见这个状态一直持续到现在,用has,不用 had.
2.C
……students differ in how they learn.This difference depends on their backgrounds,experiences and natural ability.但是这两句话变成从句,原来的动词改用ing.