室外检修道岔调整时，应（）。

A.先表示，后密贴，先主缺口、后副缺口。

B.后表示，先密贴，后主缺口、先副缺口。

C.先表示，后密贴，先副缺口、后主缺口。

D.后表示，先密贴，先主缺口、后副缺口。

. After he graduated from college, he _______ his father’s business.

A．took over

B．took up

C．took in

D．took on