(2013·安徽合肥三校一模)—Was it at 11 o'clock your father came back last night?
—Yes, he is always ing back so late.
A. that
B. while
C. when
D. until
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(答案→)A. that
B. while
C. when
D. until
解析：选A 考查强调句型。句意：“你爸爸昨晚是11点才回来的吧？”“是的，他总是这么晚回来。”此句是一个强调句结构，that是强调句的结构词，被强调的部分是at 11 o'clock。