问题描述:
He was working hard at English so that he ______ make progress in his English
A.was able to B.could
为什么A不选,经过努力获得成功用be able to 不是更好吗
A.was able to B.could
为什么A不选,经过努力获得成功用be able to 不是更好吗
问题解答:
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