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【单选题】
命题“正方形的两条对角线互相垂直平分”是( )A.
简单命题
B.
形式的命题
C.
p∨q 形式的命题
D.
p∧q 形式的命题
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反馈参考答案：
举一反三
【单选题】My sister met him at the Grand Theater yesterday afternoon, so he ______ lecture.
A.
mustn’t have attended
B.
needn’t have attended
C.
couldn’t have attended
D.
shouldn’t have attended
【单选题】My sister met him at the Grand Theatre yesterday afternoon, so he ______ your lecture.
A.
couldn't have attended
B.
needn't have attended
C.
mustn't have attended
D.
shouldn't have attended
【单选题】My sister met him at the Grand Theater yesterday afternoon, so he ______ your lecture.
A.
couldn't have attended
B.
needn't have attended
C.
mustn't have attended
D.
shouldn't have attended
【简答题】婴幼儿缺铁性贫血最常见的原因为 ,成人缺铁性贫血的最常见的原因是 。
【单选题】My sister met him at the Grand Theatre yesterday aftemoon , so he _____ your lecture. [ ]
A.
couldn't have attended
B.
needn't have attended
C.
mustn't have attended
D.
shouldn't have attended
【单选题】My sister met him at the cinema yesterday afternoon, so he your lecture.
A.
couldn’t have attended
B.
needn’t have attended
C.
mustn’t have attended
D.
shouldn’t have attended
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