...base access, is problematical at best.这句话,that引导了主语从句,considering作为非谓语动词用现在分词我能理解,可是在张满胜老师的著作中解释说,considering后面的shrinking U.S. defense budgets and diminishing overseas base access是并列...
He spoke so fast that I could not follow.It was so easy a question that every one of us could answer it.Much to his surprise,none of them could tell the difference between them.这些个例句中的could是表示过去的能力吗?她们能否用 was able to来替代?