英语选修6外研版module1—6作业（2）及答案 一、单项选择 (共 小题，每小题 分) 1. having a trip abroad is certainly good for the old couple, but it remains _____ whether they will enjoy it. a. to see b. to be seen c. seeing d. seen 2. the explanation of our teacher will make the reading easy ______. a. to be understand b. to understand c. understood d. understanding
