1. elective
At our high school, French is an elective.
英语 单词“facoltativo“(elective)出现在集合中:
TOEFL - Campus Vocabulary 51 - 752. optional
The word "the" is optional in this sentence.
Although it was optional, everyone wore their formal clothes.
is english your optional subject or obligatory?
In some countries, tipping a waiter isn’t optional, it’s obligatory.
He thinks Phisical Education should be optional.
An air conditioner is available as an optional extra.
英语 单词“facoltativo“(optional)出现在集合中:
CELI 4 - Italian for university 26 - 50