1； 500 dollars is a large ( ) of money ,but it is far less t

1； 500 dollars is a large ( ) of money ,but it is far less than we need for the program
A;number B;quantify C;sum D;total
这题为什么选sum 不 选 A 呢
2 She was never heard ( ) so wonderfully befor
A;singing B;sing C;to sing D;sung
这题是怎么 回事了 以前记得经常听用什么 偶然一次又 选 什么 了 忘了 谁 恩呢个 告诉 我 下 THINKS