第二题 committed to 决心从事…; to 是介词,后跟动词-ing形式。答案B
[例句]Russia and the other republics are committed to destroying most of their nuclear arsenals
俄罗斯和其他加盟共和国承诺销毁他们储存的大部分核武器。
第十题:答案是C,是独立主格
例如:
用作伴随状语
He was lying on the grass,his hands crossed under his head(=and his hands were crossed under his head).他躺在草地上,将两手交叉枕在脑后。
2 committed to 这里 to 是介词