下列各项中，属于会计核算基本前提的有（ ）

A．会计主体

B．持续经营

C．会计分期

D．权责发生制

E．货币计量

Only by shouting at the top of his voice__________.              .

A．he was able to make himself hear

B．he was able to make himself heard

C．was he able to make himself hear

D．was he able to make himself heard