Mike is often absent from class.” “Tell him he answer for it if he goes on behaving like

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(答案→)A. shall
B. will
C. would
D. can
解析：shall 主要有以下两个用法：
(1)用于疑问句中征求意见。如：  Shall I help you? 要不要 我帮帮你?
Shall I open the window? 要我把窗子打开吗？
(2)用于陈述句中表示允诺、告诫、警 告、威胁、命令、规定、必然性等(可用于各类人称)。如：  You shall suffer for this. 你会为此事吃苦头的。(表威胁)
Each petitor shall wear a number. 每个参赛者要戴一个号码。(表规定)
You shall hear everything as soon as you e. 你一来就可听到所有情况了。(表允诺)