Question

英语语法高手请进

1 ，Helen has been here for____
A, a year and ahalf B, a half and a year
C, one and a half year D, a half and one years

2 ，There are _____ children in the park on Children's Day.
A, ten thousand of B,ten of thousand of C, tens of thousand of D, tens of thousands of
以上两题到底该怎么区别？
求语法高手详细解释

Answer 1

1 c
2 a
好比小时 都说five and half hour

当hundred thousand这类词前面有数字时 它们本身就不加s

Answer 2

the best answer is C,D
one and a half year means 一年半
tens of thousands of 成千上万