2. 外语
  3. The new machine ought to (test) ______ before it is put to use.

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

admin2008-11-28  49
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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