Hardly had the alarm clock rung when __________, realizing he had overslept.

• Hardly এর ব্যবহার: 
- Hardly অর্থ সবেমাত্র। 
- Hardly + past perfect tense- এরূপে ব্যবহৃত হয়। 
- Structure: Hardly had + subject + verb (past participle) + Object + when + Subject + verb (past) + Object. 
- এভাবে একই অর্থে scarcely had ....... when/before এরূপে ব্যবহৃত হয়। 

Complete Sentence - Hardly had the alarm clock rung when he jumped out of bed, realizing he had overslept.

Source: A Passage to the English Language by S.M. Zakir Hussain.