— Mum, I’ve been studying English since 8 o’clock. _______ I go out and play with tom for a while ?

— No, I’m afraid not. Besides, it’s raining outside now.

A．Can’t

B．Wouldn’t

C．May not

D．Won’t

下列哪些是早搏的诱因（）

A.精神紧张

B.病毒性心肌炎

C.心脏手术

D.心导管检查

E.劳累