【题目】_____ that no effort can be spared to deal with it, or it will be too late.
A. Such gravity is the problem
B. Such grave problem is it
C. So grave a problem it is
D. Such is the gravity of the problem
在线课程【答案】D
【解析】
such is + 名词 + that从句，应该起强调作用。句意：这就是问题的严重性，否则就来不及了。故选D。