题干
Truth and honesty _______ a very important quality among people.
A：is
B：are
C：was
D：were
答案(点此获取答案解析）
A
Truth and honesty _______ a very important quality among people.
A：is
B：are
C：was
D：were
，它可发生的反应类型有
①取代 ②加成 ③消去 ④