If __unsolved ,this may lead to more serious problems.A left

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If __unsolved ,this may lead to more serious problems.A left B remained选哪个,为何?

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.
类似的情况还有：
when (he was ) still a child,he read a lot of books.
If( I am) invited,I will attend the meeting.

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