英语Byrd now knew that he would be able to reach the South Pole was 300miles away .最想知道句中的would be abl

英语Byrd now knew that he would be able to reach the South Pole was 300miles away .最想知道句中的would be abl

题目
英语Byrd now knew that he would be able to reach the South Pole was 300miles away .最想知道句中的would be able to 是什么时态,尤其想了解would 后面一定要有个be will 后面也一定要跟be why thankyou .
答案
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