Water ______ at 100 degrees Celsius at sea level.
Answer and explanation
Correct answer: A. boils
- Step 1: A general scientific fact takes the present simple.
Answer
boils.
Why not the others: "is boiling" is wrong because the continuous is not used for a scientific fact. "has boiled" is wrong because the present perfect does not express a general truth. "boiled" is wrong because the past tense does not express a general truth.
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