题目

I was really anxious about you. You _______ home without a word next time.A. mustn’t leave B. shouldn’t have leftC. couldn’t have left D. needn’t leave 答案：【答案】B【解析】试题分析：B；考查情态动词。mustn't do sth 是指禁止做……，shouldn’t have done本不应该做……，couldn’t have done本不能做……，needn't do 不需要做……；句意：我真的很担心你。你本不应该不说一声就回家的。故选B“春蚕到死丝方尽，蜡炬成灰泪始干”从家蚕的变态发育过程来看，诗中蚕的“死”是指家蚕哪个发育时期的结束 A．卵B．幼虫C．蛹D．蚕蛾