题目内容：

Frank's dream was to have his own shop___to produce the workings of his own hands.
A that
B in which
C by which
D how
凭语感也觉得是它,但是不知从语法上该如何理解.
记得老师讲评时说这句不是定语从句,in和which不是连着的.可是我没完全理解,