Question

Read each sentence carefully to find out whether there is any grammatical or idiomatic error. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, choose (e) as your option: Hardly had the staff completed the closing formalities than the power supply was suddenly disrupted.

A Hardly had the staff
B completed the closing formalities
C than the power supply
D was suddenly disrupted
E No error
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