汉与匈奴的战争中,存在一定的季节规律,分别是()和()。
A秋冬匈奴南下
B春夏汉军北上
C春夏匈奴南下
D秋冬汉军北上
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He said that the passenger _______ an accident; otherwise he would have arrived by that time
A. must have
B. must have had
C. would have had
D. should have had
“平城之围”中,被围困的是()。
A刘邦
B韩信
C张良
D卢绾
下列选项中,关于盐铁政策说法正确的是()。
A盐铁政策允许贫民私铸铁器、煮筛盐矿
B盐铁政策是有皇宫内侍提出的
C盐铁政策是指让人们大力开采盐铁矿
D盐铁政策要求盐铁官营