1.A
状语从句,(四楼的说的不在重点,三楼这道题解释不错).缺少成分时,定语从句要用which来作代词补充这一成分;此题不缺少成分,意思是我写完报告的时候差不多是四点.这是表示时间的从句,要用when.
2.D
这句话分清主句和从句,这里的主干是Foreign students are in large numbers at that internationl school.这里whom是代表foreign students.most of (them)作补足语.
3.B
首先,用法有两种:lose onself in thought和be lost in thought.这里,用伴随的形式,为Being lost in thought,he was almost run down by a bike.这里的Being可以省略,可以理解为lost当形容词,形容词表示状态,就可以这样用了.或者也可以说Losing himself in thought……
4.A
he supposed做插入语,不影响句子的时态和结构顺序,可以删掉不看.那么,就变成了一个简单的定语从句.这句话的从距离没有主语成分,所以要用which来代替the damage来作从句的主语.