【Myfatheroften________histeeth______halfpastseveninthemorning．（）A.brush；atB.brushes；atC.brushs；onD.brushes；in】

　　My father often ________ his teeth ______ half past seven in the morning．（）

　　A.brush； at

　　B.brushes； at

　　C.brushs； on

　　D.brushes； in