_______in conversation,they didn't notice me entering the ro

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_______in conversation,they didn't notice me entering the room.
______in conversation,they didn't notice me entering the room.
1.engaged
2.engaging
3.engaged themselves
4.having engaged themselves
为何不选原因详解

选 1.engaged
Engaged in conversation,they didn't notice me entering the room.他们忙着说话,都没注意我进屋了.
engaged 形容词,从事...的;忙於...的[(+in/on)],后面不用加反身代词,所以2,3,4都不对.
例如:
He is engaged in his business.
他忙於他的生意.
We are engaged in compiling a dictionary.
我们正忙於编一本字典.
She was engaged in protecting wild birds.
她致力於保护野生鸟类的工作.
She is now engaged in writing letters.
她现在正忙著写信.

_______in conversation,they didn't notice me entering the ro (1).in an experiment,they didn't notice me entering the room but they didn't notice they didn’t discover until the happened to enter the back ro 16.I didn’t read the notice.____ 一道选择题she poured water______her jacket before entering the ro 英语情态动词问题Don't throw the bottles away.They _______in the futu 英语单句改错At entering the room ,I found they were waiting for me because of his _ on his studies,he didn't notice me passing 英语短句翻译1. Absorbed in reading,he didn’t notice me behind him. Miss Green ____ ____ ____ ____ and didn't notice me when I p Miss Green ____ ____ ____ ____and didn't notice me when I pa