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单项选择题
He was late for work this morning because he_______find his key.
A.mustn't
B.wouldn't
C.couldn't
D.shouldn't
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多项选择题
以下属于可以对细胞的某些结构进行标记的荧光染料是( )
A、双偶氮苯酚
B、Alexa568
C、FITC
D、醋酸铀
单项选择题
He' s a great player and I have a lot of respect_______him.
A.of
B.in
C.on
D.for
单项选择题
A.见图A
B.见图B
C.见图C
D.见图D
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