The new machine ought to (test) ______ before it is put to use.be tested新机器在使用之前

游客2024-08-01  11

问题 The new machine ought to (test) ______ before it is put to use.

选项

答案 be tested

解析 新机器在使用之前要先做测试,根据句意,这里应该用被动语态。
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