题目内容
The manager promised to have my complaint ________.
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You can’t be ________ careful in making the decision as it was such a critical case.
Children are ________ to have some accidents as they grow up.
We have done things we ought not to have done and ________ undone things we ought to have done.
The ratio of the work done by the machine ________ the work done on it is called the efficiency of the machine.
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