摘要: -I haven’t got the reference book yet, but I’ll have a test on the subject next month. -Don’t worry. You have it by Friday. A. could B. shall C. must D. may w 答案:B. 解析:shall在第二人称中表示允诺.还可以表示强制.命令.威胁.警告.还有在法律条文中的要求或规定.

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