The students ______ busily when Miss Brown went to get a book she ______ in the office.[ ]

A. had written; left

B. were writing; has left

C. had written; had left

D. were writing; had left

有一非抗震设计的简支独立主梁，如图3-6所示，截面尺寸6×h＝200mm×500mm，混凝土强度等级为C30，纵向受力钢筋采用HRB400（），箍筋采用HPB300（φ），梁受力纵筋合力点至截面近边距离as＝35mm。

已知q＝10.0kN／m（包括梁自重），Vaq／Ra＞0.75，Vaq为集中荷载产生的梁端剪力，Ra、Vaq、q均为设计值。梁端已配置φ8@150（双肢）箍筋。试问，该梁所能承受的最大集中荷载设计值P（kN），最接近下列何项数据（）？

A.123.47

B.144.88

C.112.39

D.93.67