They are only study(还是studying) for long time.

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Theyareonlystudy(还是studying)forlongtime.Theyareonlystudy(还是studying)forlongtime.Theyareonlystudy(还是s

They are only study(还是studying) for long time.
They are only study(还是studying) for long time.

They are only study(还是studying) for long time.
studying
有are了,当然是studying

当然是studying
be doing 固定句式

studying

studying
这是现在进行时态,由主语+be+动词-ing(现在分词)构成

studying
虽然study可以用作名词 表示学习 不过用在这里不通啊 你不能说他们是学习

be only doing
固定搭配