问题
选择题
It was seven o;clock in the morning ____ he came back.It was really at seven o’clock ___ he came back from work this morning.
A．that; that
B．when;when
C．when; that
D．that;when
答案
答案：C
本句的第一空用where引导时间状语从句子，而第二空用that构成一个强调句型。