什么外语最好学？
those days 前面能加介词in 吗?
Tom lived a hard life in those days.中强调“在”那段日子的过程当中，因为“live”是个可延续性动词，所以用in
相反 Lily went to Beijing this morning. 中went是不可延续性动词，this morning强调的仅仅是这个时间，没有时间短（延续性）的意义。所以不用in
Father is writing novel these days. 句中，如果用进in也是可以的。
总的说来，强调时间点，动词是非延续性的，那么就不用
强调时间段，动词是延续性的，则可用可不用。
（我是英语老师，希望回答对你有帮助）
several是什么意思？
形容词 a. [Z]
1.几个的,数个的[B]
He was seriously injured in the accident and died several days later.
他在那次事故中受了重伤,几天后就死了。
2.【书】各不相同的,各自的[B]
代词 pron.
1.几个,数个
Several have quit working.
有几个人已经辞职了。
Several of the windows were broken.
有几扇玻璃窗被砸碎了。
