These problems may lead to more serious ones if ___unsolved.A.making B.remained C.keeping D.leftThese problems may lead to more serious ones if ___unsolved.A.making B.remained C.keeping D.left
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These problems may lead to more serious ones if ___unsolved.A.making B.remained C.keeping D.leftThese problems may lead to more serious ones if ___unsolved.A.making B.remained C.keeping D.left
These problems may lead to more serious ones if ___unsolved.A.making B.remained C.keeping D.left
These problems may lead to more serious ones if ___unsolved.
A.making B.remained C.keeping D.left
These problems may lead to more serious ones if ___unsolved.A.making B.remained C.keeping D.leftThese problems may lead to more serious ones if ___unsolved.A.making B.remained C.keeping D.left
首先if后有省略,问题是被留下没解决,排A C
B是不及物动词,没有被动,因此选D
if引导的从句主语还是problems
make keep leave的主语必须是人
remained用过去时是因为虚拟
if the problem remained unsolved, they may lead to more serious ones
B,与现在事实相反, 从句用did(were)主句(would/should/could/might do sth)
I think it's D.
These problems may lead to more serious ones, if they(these problems) are left unsolved
C
These problems may lead to more serious ones if they are left unsolved.