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【单选题】
在人类个体发育过程中,最早的造血活动始于A.
胚胎第12
B.
胚胎第10
C.
胚胎第8
D.
胚胎第6
E.
胚胎第3~4
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【单选题】(120616)She was quite sure that she ______ the door before she left the office.
A.
will lock
B.
would lock
C.
has locked
D.
had locked
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