would be语法请帮忙,急用!
问题描述：
would be语法请帮忙,急用!
The impressive economic growth by China over the last quarter of a century would be unthinkable without the economic freedom brought about by reforms initiated in 1978 by the Chinese leadership.
请问此句中的would be改如何解释它的语法功能呢?
答
标志揣测语气,即虚拟语气.