“I’m certainly more and more to the conclusion that Iraq has, ___they maintained（断言）, destroyed almost all of _____ they had in the summer of 1991.” Blix said.

A．which, what

B．as, which

C．as, that

D．as, what

冷轧板带轧辊得轧辊直径为什么必须按最小轧制厚度来确定？