while other students are busy preparing for the eaxm ,he___relaxed on the playground.A.remained B.remains C.is remained D.has been remaining正确答案是B.为什么?

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while other students are busy preparing for the eaxm ,he___relaxed on the playground.A.remained B.remains C.is remained D.has been remaining正确答案是B.为什么?
while other students are busy preparing for the eaxm ,he___relaxed on the playground.
A.remained B.remains C.is remained D.has been remaining
正确答案是B.为什么?

while other students are busy preparing for the eaxm ,he___relaxed on the playground.A.remained B.remains C.is remained D.has been remaining正确答案是B.为什么?
一般现在时
A是过去
C是被动
D 是完成
前面是目前的状况

remain是一个半系动词,意思是保持,也就是处于某种状态的意义。这里relaxed是过去分词当形容词使用,做表语,所以谓语remain不能用被动语态。
而且整个句子是一般现在时态,所以其它答案都错
用法类似于get。