暑假作业3。Theyfoundthelecturehard___
3。They found the lecture hard_____ A to understand B to be understood 我选第二个，可答案是第一个
hard to understand其实是作the lecture 的补语 the lecture 是宾语, 所以,hard to understand就是宾语补足语，用来修饰the lecture 的!不用被动，只要弄清楚对象就ＫＯ咯！