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填空题
The new machine ought to (test) ____ before it is put to use.
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解析：
本题考查语态。句意：新机器在投入使用之前应该检测。主语machine与动词test之间是一种动宾关系，应该用被动语态。ought to后接动词原形，故填入be tested。
本题考查语态。句意：新机器在投入使用之前应该检测。主语machine与动词test之间是一种动宾关系，应该用被动语态。ought to后接动词原形，故填入be tested。
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