聚合方法分为（）大类，大多数乙烯基单体发生（）聚合，大多数非乙烯基单体发生（）聚合。
参考答案：两；连锁；逐步
When the seriously injured man was taken to a hospital _____, he was half conscious; while lying in bed, he heard a voice ______ calling him. [ ]
A. close; at a distance
B. near; in the distance
C. nearby; in the distance
D. close; from distance
It's the third time _______ late this month.
[ ]
A. that you arrived
B. when you arrived
C. that you've arrived
D. when you've arrived
