Susan decided not to work on the program at home because she didn’t want her parents to know what she     .

A．has done

B．had done

C．was doing

D．is doing

下列哪种情况一般不引起P-R间期延长（）

A.风湿性关节炎

B.病毒性心肌炎

C.室间隔缺损

D.急性肾炎

E.口服地高辛