该题应该选A.在条件和时间状语从句中,主语和动词be可以省略.但必须同时省略.If (it is) left unsolved ,this may lead to more serious problems.而remain一词不能用于be remained结构.没有动词be,就不能省略主语.类...
If __unsolved ,this may lead to more serious problems.A left
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