I usually have less money at the end of the month than () at the beginning of the month.

单项选择题() here for 3 years, she has been quite experienced in dealing with those affairs.

A.Having worked
B.Having been worked
C.Have worked
D.Worked

单项选择题() you can find the way home, I will leave you now.

A.Since
B.As
C.While
D.As if