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
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.left
These problems may lead to more serious ones if ___unsolved.
A.making B.remained C.keeping D.left
英语人气：351 ℃时间：2019-08-22 15:00:22
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