It was just at the timethe bell rang he finished the last word in his composition.A. when;

问题补充：

It was just at the timethe bell rang he finished the last word in his composition.

A. when; which

B. that; when

C. when; that

D. that; which

答案：

A. when; which

B. that; when

(答案→)C. when; that

D. that; which

解析：本题考查定语从句及强调句。when引导定语从句，先行词time在从句中作时间状语，后面that为强调句It was … that…结构，选C。