we were amazed to see

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an amount of +不可数名词
a quantity of 接不可数名词或者
可数名词复数
a great deal of接不可数名词
======以下答案可供参考======
供参考答案1:
an amount of 和.a great deal of 修饰不可数名词
a number of 修饰可数名词
a quantity of 既能修饰可数名词，又能修饰不可数名词
我觉得B/C都行，可能C更常用吧。
供参考答案2:
In a city so dead 在这死寂的城市之中 Held up so high 将我紧紧的We were meant to be, supposed to be, but we lost it 我们被希望成为