单项选择-Youmust（）alettertoyourmothertomorrow.-Well,Iwill,Dad.A.writeB.towriteC.writetoD.writing为什么?
<p>问题：单项选择-Youmust（）alettertoyourmothertomorrow.-Well,Iwill,Dad.A.writeB.towriteC.writetoD.writing为什么?<p>答案：↓↓↓<p class="nav-title mt10" style="border-top:1px solid #ccc;padding-top: 10px;">程连贞的回答：<div class="content-b">网友采纳 A must情态动词,后面必须是动词原形 writesthtosb写东西给某人
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