问答题

Unless it is officially stamped，__________(这个文件无效)．

【参考答案】

this document is invalid
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单项选择题
Why did some TT practitioners agree to be the subjects of Emily’’s experiment
A．It involved nothing more than mere guessing.
B．They thought it was going, to be a lot of fun.
C．It was more straightforward than other experiments.
D．They sensed no harm in a little girl’’s experiment.
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