单选题
Of great significance the nation-wide movement is ______ the Kampuchean
people in their heroic struggle against the aggression of the Vietnamese.
A. to support
B. for supporting
C. supporting
D. of supporting
【正确答案】
A
【答案解析】主题句由于主语较长，采用了倒装结构，可还原为：the nation-wide movement to support the Kampuchean people in their heroic struggle against the aggression of the Vietnamese is of great significance。movement要求不定式充当定语，其他选项均不符合语法规则。