Of course._____ of them studies very hard.

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Of course._____ of them studies very hard.

Of course._____ of them studies very hard.
Of course._____ of them studies very hard.

Of course._____ of them studies very hard.
one

选择B studies是三人称单数,所以前面不能用all 、 some,every不能与of连用,所以选择A,“他们中的每一个”