英语.It is very kind ____ you to help me with my lessons becau

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英语.
It is very kind ____ you to help me with my lessons because it is very difficult ______ me to learn them well
A of ;of B of ;for C for; of D for ;for
Will you stay at home ____ your sister comes back
Sorry,I can't .I have a meeting and have to go in ten minutes
A before B until C while D after

1 B of表示从属关系,kind of you表示你真好...for表示“对于”的意思,difficult for me 表示对于我来说太难了
2 B 其他三个一样可以用,但是根据语境和表达来说,B最合适,恰恰表示出,等你妹妹回来之后,你再走的意思.
语言这东西没什么为什么,就这么说...别人怎么说你也怎么说就好了.

英语.It is very kind ____ you to help me with my lessons becau It is very kind _____ you to help me with my lessons. It is It is very kind _____ you to help me with my lessons because -It is very kind of you to help me with my english.-____.A.T It is very kind------you to help me with my math.It is hard- It is very kind _____ you to help me with my work because it it is very kind of you to help me with my chinese同义句 ( )61.—It is very kind of you to help me with my English.—__ Would you be ____ to help me with my lessons? It's very kind of you to help me with my maths. It is very kind of you to help me. It is very kind of you to help me的help前为什么要加to