The experiment had to be ____ because the equipment broke down.
Answer and explanation
Correct answer: D. called off
- Step 1: The sentence needs a phrasal verb meaning cancelled. Step 2. 'Call off' means to cancel an event or activity. Answer: called off. Why not the others: 'called on' means visit or ask; 'called up' means telephone or summon to service; 'called in' means ask someone to come and help.
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