基礎ENGL-COND-001
Which sentence correctly uses the zero conditional?
A. If water reaches 100°C, it boils.✓ 答案
B. If water reaches 100°C, it will boil.
C. If water reached 100°C, it would boil.
D. If water has reached 100°C, it boiled.
解說
Zero conditional states general truths or scientific facts. Both clauses use present simple: 'if + present simple, present simple'. Option B is first conditional (future), C is second (hypothetical), D is incorrect tense.