first 的用法This company was the first ( )portable radio as well a cassette tape recorders in the world1producing 2to produce 3having produced 4produced请问选2对吗

first和firstly的用法? Is this的用法 this指针的用法 this指针的用法 this的用法 this,that的用法 My accounts balance for the first time this year.帮忙解释一下balance 的用法同志们,,我要balance的用法啊 first与at first 在用法上的区别同上 one-first-the first的用法,举个例子, 是first thing first还是first things first?有前面的那种用法么？那种用法对么？ “the first time+句子”的相关用法? $(this).find('ul:first li'); jquery用法 ul:first li 是获取第一个ul$(this).find('ul:first li'); jquery用法 ul:first li 是获取第一个ul 还是获取ul下的第一个li郁闷 就两个选择 我改相信你们哪个! 为什么This was the first time that I talked to a foreign friend in English在 I 后不用加had? 顺便写一下This was the first time that从句的用法 this kind of 的用法 this is the first time 后加什么时态 以及其他这类的词的用法拜托各位了 3Q LiLei was the first person to come to the classroom in this morning.这里的to come to是怎么用法?谢 As you know,this is my first term being the secretary of the Student'Union secretary.这里的being是什么用法,为什么这样用? As you know,this is my first term being the secretary of the Student'Union secretary.这里的being是什么用法,为什么这样用