组卷网 > 高中英语综合库 > 语法 > 词法 > 情态动词 > 情态动词的用法 > must的用法 > must表示“必须”“应当”
题型:单项选择 难度:0.85 引用次数:635 题号:11599051
Whale breathe through lungs just as we humans do,so they_______come up for air.
A.mayB.canC.mightD.must
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