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【单选题】

How long has Mr. Wang been here

A.
He arrived here three hours ago.
B.
He’s been here for an hour.
C.
He came here half an hour ago.
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参考答案:
参考解析:
.
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举一反三

【单选题】肾病综合征出血热:()

A.
外周血WBC增高
B.
自然疫源性疾病
C.
两者均有
D.
两者均无