问题标题：
英语选择.1.I____giveyouananswertomorrow,Ipromise!A.mustB.willC.mayD.shall2.---Theyhavenotfinishtheworkuptonow.---Well,they___.A.shouldhaveB.shouldC.oughttoD.oughttohave3.___youbehappy!A.mayB.canC.mustD.would请简要
问题描述：
英语选择.
1.I____giveyouananswertomorrow,Ipromise!
A.mustB.willC.mayD.shall
2.---Theyhavenotfinishtheworkuptonow.
---Well,they___.
A.shouldhaveB.shouldC.oughttoD.oughttohave
3.___youbehappy!
A.mayB.canC.mustD.would
请简要地说明原因（最好详细）
段吉安回答：
B
根据tomorrow判断用一般现在时,选will.
A
根据题意应选他们本该完成任务,用shouldhave(done)表示本应该做,但没做的事.
A
表示祝愿用may.
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