高二英语选择题,请解释This problem may lead to more serious ones if ______ unsolvedA.remainedB.left为什么答案是B而不是A,A为什么不行?

问题描述:

高二英语选择题,请解释
This problem may lead to more serious ones if ______ unsolved
A.remained
B.left
为什么答案是B而不是A,A为什么不行?

A 保持B 被(留下)其实这是个省略句!完整如下:This problem may lead to more serious ones if (it is )______ unsolved .明显是被动语态,而remain适用于主动句中,如:It remains new.它仍保持新的.这里只能用被动的l...