I had only just put the phone down when the bo...

Câu hỏi: I had only just put the phone down when the boss rang back.

A I put the phone down when the boss rang back.

B Hardly had I put the phone down when the boss rang back.

C No sooner had I put the phone down when the boss rang back.

D Scarcely had I put the phone down than the boss rang back.