a knowledge of sth 是固定用法指对于某事的掌握.
第二个空若有冠词则是对于trade的,这里显然不能用a,而the也不对,因为它不是特指某商业交易.internation trade 内贸
Many people agree that___knowledge of English is a must in___internation trade today.
Many people agree that___knowledge of English is a must in___internation trade today.
为什么第一个要填a,第二个不填阿?
为什么第一个要填a,第二个不填阿?
英语人气：645 ℃时间：2019-08-17 19:44:12
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