试题题干
Fill in the blanks with the appropriate words given in the group.
seconds, minutes, years, which, that, what
The traffic was held up for more than thirty 
, caused me to come late.
参考答案
试题解析
句意：交通阻塞了三十分钟，这使我迟到了。根据常识可知，交通堵塞应为30分钟；which引导非限定性定语从句。