单选题
The hole in the stratospheric ozone layer over Antarctica did not grow as fast this year ________on average between 1991 and 2006.
A、
as it
B、
as that
C、
as that did
D、
as it did
【正确答案】
B
【答案解析】
虚拟语气题。破折号前为主句，破折号后为whether…or…引导的让步状语从句。whether…or…引导的让步状语从句使用虚拟语气时，谓语动词用原形。故B为答案。
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