贸易顺差是一种很难改变的习惯.
这里的 a 是指一种、一类.
当指一种、一类时,就会有上述情况啦.
语法：Trade surpluses are a habit that is hard to break.
语法：Trade surpluses are a habit that is hard to break.
可以“复数are a单数”这种形式吗?一般在什么情况下这样用?
可以“复数are a单数”这种形式吗?一般在什么情况下这样用?
英语人气：610 ℃时间：2020-03-18 08:38:50
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