题目内容
（请给出正确答案）
[主观题]
The monitor ______ ill, we'd better put the meeting off.A．isB．has beenC．beenD．being
The monitor ______ ill, we'd better put the meeting off.
A．is
B．has been
C．been
D．being
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A．HLA-DP
B．HLA-D
C．SD抗原
D．LD抗原
E．HLAⅢ类分子
