主要收藏皇帝的实录、圣训和玉牒的皇家档案库的集中代表是（）。
A、后湖黄册库
B、皇史宬
C、文渊阁库楼
D、古今通集库
参考答案：B
I would have come earlier, but I _____ that you were waiting for me.[ ]
A. didn't know
B. hadn't known
C. haven't known
D. wouldn't have known
乘法分配律不能改变运算顺序。
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