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【单选题】
关于NK细胞抗肿瘤作用，下列哪项不正确A.
释放穿孔素直接杀伤
B.
促进瘤细胞凋亡
C.
释放自然杀伤因子
D.
杀伤作用受MHC限制
E.
促进瘤细胞凋亡、释放自然杀伤因子
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【单选题】—Dad, when will you be free? You agreed to go to the seaside with me four days ago. —I'm sorry, Jack. But I think I will have a _______ holiday soon. [ ]
A.
four-days
B.
four-day
C.
four days
D.
four day
【单选题】Will you be free to ______ tomorrow afternoon, Mrs. Darcy?
A.
come to
B.
come across
C.
come over
D.
go here
【单选题】Will you be free to ______ tomorrow afternoon,Mrs.Darcy?
A.
come to
B.
come across
C.
come over
D.
go there
【单选题】—Dad, when will you be free? You agreed to go to the seaside with me fourdays ago. —I'm sorry, Jean. But I think I will have a holiday soon. [ ]
A.
four-days
B.
four-day
C.
four days
D.
four day's
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