What worried the child most was ____to visit his mother in the hospital .

A．his not allowing

B．his not being allowed

C．his being not allowed

D．having not been allowed

决定心肌梗死患者预后的最主要因素为（）.

A.心律失常

B.心功能

C.年龄及病程

D.高血脂及高血压

E.心肌细胞坏死的数量