第2题:[单选题]( )Why is the ISM Code mandatory? A.To satisfy US Coastguard B.To improve safety C.To save money for the company D.To get lover insurance premiums 参考答案:B
第30题: [单项选择]When you are in your room, leave the door ______ so that your visitors do not have to knock. A. open B. opened C. opening D. being open 参考答案:A 答案解析:[解析] “leave...+v.示“让……保持一种状态”,后面应该用动词原形或形容词形式。