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【单选题】
My father knows a lot about American culture, for he _____ there for 2 years, and then he returned home. [     ]
A.
stays
B.
stayed
C.
would stay
D.
have stayed
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A.
two other little
B.
little two other
C.
two little other
D.
little other two
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A.
刺激时间
B.
刺激强度
C.
刺激的强度-时间变化率
D.
刺激速度
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A.
所有癌前病变都必然转变为癌
B.
癌前病变是不可逆转的
C.
是具有癌变潜在可能性的良性病变
D.
癌前病变不伴有上皮不典型增生
E.
癌前病变仅为上皮增生明显
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A.
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B.
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A.
正确
B.
错误
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A.
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B.
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