He had scarcely started presenting his project ________ the fire alarm started ringing continuously.

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A than
B then
C when
D but

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Answer: C. when

• Explanation: C) when is correct because "scarcely... when" is a standard grammatical pairing used to show one past action happening immediately after another.

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He had scarcely started presenting his project ________ the fire alarm started ringing continuously.

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