The student’s behavior cost the teacher a steepless night . He never thought his student ______ computer games for a whole class .

A．played

B．was playing

C．had been playing

D．would play

因血管舒缩障碍所致晕厥的疾病是

A．颈动脉窦综合征

B．高通气综合征

C．低血糖综合征

D．阿-斯综合征