—You have set aside more time to play with our kids. —I wish I ______, but you know how busy I was. A. should, would B. could, did C. might, should D. should, had 答案:D下列关于热机和环境保护的说法中正确的是()A.所有的热机都是利用柴油、汽油作燃料的B.汽车的排出的气体都是有毒物质C.热机的大量使用会造成环境污染D.只要注意技术革新,热机的效率是有可能达到100%