射频消融治疗心房颤动时可导致的并发症（）
A.心脏压塞
B.卒中（包括栓塞和出血）
C.败血症
D.血气胸
E.食管-左心房瘘
参考答案：A, B, E
—Why did you leave the water running in the sink?
—My goodness! I guess I ____ to turn off the tap．
A．forgot
B．have forgotten
C．forget
D．had forgottten
选择填空。
It is very cold this winter. There's too much ______. [ ]
A．snow
B．snowy
C．snowing
D．snows
