We often talk a great deal about English language teaching, ______ that it is the learning that really matters.[ ]

A. having forgotten

B. forgotten    

C. forgetting     

D. to have forgotten

符合过敏性紫癜的实验室检查是（）

A.血小板减少

B.凝血酶时间延长

C.凝血时间延长

D.血块收缩不良

E.毛细血管脆性试验阳性