日語 Japanese Ask Questions Thread2 質問

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Japanese - Ask questions thread
http://dis.4chan.org/read/lang/1174719097/l50

thanks, I'm the guy who uses の and asked the question but still a little confused.
So dictionary form plus の is fine, but is か just as acceptable? Does it send a slightly different feeling? To me, 勉強してるか？ sounds kind of weird where 勉強してるの？ sounds more natural.