填空题

A professor reported that he_________________________(已发现一种新方法帮助老人) improve their memories.

【参考答案】

A professor reported that he had discovered a method to h......

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单项选择题
A．The train will arrive on time.B．The train has already arrived thirteen minutes ago.C．The train will arrive in thirteen minutes.D．The train will be late for thirty minutes.
A．The train will arrive on time.
B．The train has already arrived thirteen minutes ago.
C．The train will arrive in thirteen minutes.
D．The train will be late for thirty minutes.
填空题
A day or two_____________________(顺利完成这项任务足矣).
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