单项选择题

The 25 trials involved roughly the same number of participants.（）

A． Right
B． Wrong
C． Not mentioned

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单项选择题
The trials were stopped early because the treatments proved to be of no value.（）

A． Right
B． Wrong
C． Not mentioned
单项选择题
The number of prematurely stopped clinical trials has increased recently.（）

A． Right
B． Wrong
C． Not mentioned
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