填空题

S41

【参考答案】

switching
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单项选择题
A．Because it is too difficult.B．Because it is too easy.C．Because it allows cheating.D．Because it uses a limited question pool.
A．Because it is too difficult.
B．Because it is too easy.
C．Because it allows cheating.
D．Because it uses a limited question pool.
填空题
S40
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