Most of us_________more than one thousand English words before we came to this school.                                                           ( )

A．would learn

B．will learn

C．have learned

D．had learned

有关特发性血小板减少性紫癜下列哪些说法是正确的（）

A.目前认为是一种变态反应性疾病

B.主要临床表现为皮肤紫癜、粘膜出血

C.慢性型多见于青壮年

D.脾脏常肿大

E.慢性型可伴有血小板相关补体的增高