So involved in his business _________ that he can hardly accompany his wife and child at weekends.[ ]

A. the manager has become              

B. becomes the manager

C. has become the manager              

D. has the manager become

（2008）张某出国留学前将登记用途为商住的房屋（底层为商铺、二楼为住宅）转让给刘某。在办理了交易过户有关手续后，刘某向甲银行申请抵押贷款并获准，得到贷款40万元，半年后又将该房屋抵押给乙银行，得到贷款15万元。在抵押期间，未经甲、乙银行同意，刘某便将该房屋出租给陈某，但将抵押事实书面告知了陈某。刘某贷款还款期到后，因炒股失败无力归还贷款，此时陈某与刘某约定的租赁期限尚未届满。

刘某购买房产的过程中，应当申请办理（）登记。

A.房屋转移

B.房屋更正

C.房屋抵押

D.地役权