Discussion
Choose the appropriate verb form to fill in the blank :
The efficiency of a plant __________ by the load it can take.
Answer: B
The answer is is known: The efficiency of a plant is known by the load it can take.
The subject, the efficiency of a plant, does not know anything; it is what is judged. So the verb must be passive, and a general truth calls for the simple present: is known.
Knows and has known are active forms, which would make efficiency the knower. Has been known is passive but in the present perfect, which suits a state continuing up to now rather than a general rule.
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