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【参考答案】

将waiting改为wait。
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The simplest method of ________________ (焊接两块金属) is known as pressure welding.
单项选择题
A．Go to the library.B．Get some exercise.C．Go to see a film.D．Do homework in school.
A．Go to the library.
B．Get some exercise.
C．Go to see a film.
D．Do homework in school.
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