对放疗极敏感的卵巢肿瘤是：

A．异型细胞局限在上皮层上1/3
B．异型细胞局限在上皮层上1/3～2/3
C．宫颈重度不典型增生
D．子宫细胞局限在上皮全层，腺体受累，但未突破基底膜
E．癌细胞浸润突破基底膜下2mm，宽度3mm

In New York I found my friend Collins, who       there some time before me.

A．would arrive

B．has arrived

C．had arrived

D．was arriving