下列哪项增加左心室前负荷可导致左心衰竭()
A.主动脉瓣狭窄
B.高血压
C.二尖瓣关闭不全
D.肥厚性心肌病
E.肺动脉瓣狭窄
参考答案:C
We usually play ______soccer for half _____hour on _____playground.
A./ ;an;the
B.the;a;the
C./ ;a;/
D.the ; an ; a