下列哪次古代著名战役确立了三国鼎立局面?()
A.官渡之战
B.赤壁之战
C.夷陵之战
D.长平之战
参考答案:B
解析:赤壁之战曹操被孙刘联军打败,确定了三国鼎立的局面。
— Sorry, Professor Smith. I didn't finish the assignment yesterday.
— Oh, you _____ have done it as yesterday was the deadline. [ ]
A. must
B. mustn't
C. should
D. shouldn't
简要分析通货膨胀的各种成因?