___himself in his studies,he didn't notice that his father came into the room A .buried B.burying C.to bury D .being buried

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___himself in his studies,he didn't notice that his father came into the room A .buried B.burying C.to bury D .being buried
___himself in his studies,he didn't notice that his father came into the room A .buried B.burying
C.to bury D .being buried

___himself in his studies,he didn't notice that his father came into the room A .buried B.burying C.to bury D .being buried
选B.做伴随呢亲.

B
B
B
B
B
active voice, 所以用gerund

A