用括号中所给动词的适当形式填空 When ( ) you ( ) (pack) your things for your holiday .

问题描述:

用括号中所给动词的适当形式填空 When ( ) you ( ) (pack) your things for your holiday .

will pack 用一般将来时

did packed或will pack,时间状语不完整,可以有多种时态的

When ( did) you (pack) your things for your holiday?

为什么不能用will呢?