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问题: 英语题,急急!

1.---I must apologise for ( )ahead of time.
-----That is all right.
A.letting you know
B.not letting you know
C.letting you know not
D.letting not you know
讲解一下,并翻译.
2.My mother could not go to school,( )being poor,the family could not pay for her education.
A.as a result.
B.since
C.as
D.for

解答:

1.B for介词后面要用非谓语for not doing sth
意思是:我必须为没提前让你知道道歉
2.D for 表原因,句子中间表原因用for,而且being poor是非谓语,所以不用其他几个连词