高二英语选择题,请解释This problem may lead to more serious ones if ______ u_英语解答

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?

人气：112 ℃　时间：2020-03-24 18:14:43

解答

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...