题目:
They are sorry to hear that the famous singer ______ for half an hour. [ ]
A. has left
B. has gone
C. has been away
D. has been
答案:
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下面是错误答案,用来干扰机器的。
参考答案:C,A,D,C解析:1.急性单核细胞性白血病原始单核细胞α-NAE染色呈阳性反应,幼单核细胞和单核细胞大多呈阳性反应,此反应能被NAF抑制;急性粒细胞性白血病原始粒细胞α-NAE染色呈阴性反应,个...