— _______ you got to know my telephone number?

— Through a friend of yours.

A．How was it

B．How was it that

C．Was it how that

D．How did

离合器之释放承轴系（）

A.装在变速箱之离合器轴上

B.装置在变速箱离合器轴之轴承座套上

C.离合器接合后会一起转动

D.必须与释放杠杆一直保持接触