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【单选题】
下列关于免疫的叙述，正确的是 [     ]
A.
吞噬细胞吞噬外来细菌，必须有抗体参与
B.
某人体内的B细胞和T细胞所含基因不同，功能也不同
C.
“先天性胸腺发育不全”的患者，细胞免疫有缺陷
D.
抗体是由效应T细胞中的有关基因指导合成的
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【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
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mustn't have attended                
D.
shouldn't have attended
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B.
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【简答题】对人物图像进行修复时()将原图复制一份
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【单选题】My sister met him at Ningbo Grand Theatre yesterday afternoon, so he your lecture.
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【单选题】My sister met him at the cinema yesterday afternoon, so he your lecture.
A.
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B.
needn’t have attended
C.
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查看完整题目与答案