单项选择题

Stuart Pocock believed that in no case should clinical trials stop early.（）

A． Right
B． Wrong
C． Not mentioned

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单项选择题
Why did the author almost fall on the floor（）

A．Because she had been working too hard
B．Because she had been deceived
C．Because she could hardly believe her eyes
D．Because she had been tripped
单项选择题
54（）

A．with
B．on
C．in
D．upon
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