问题描述：
1、The manager was concerned to hear that two of this trusted workers ( ).答案是were leaving.为什么不能用现在完成时.
2、By the time you have finished this book,your meal ( will get ) cold.为什么是将来时
2、By the time you have finished this book,your meal ( will get ) cold.为什么是将来时
问题解答：
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