He had just reached home a man called to see him.
A. while
B. after
C. until
D. when
网友回答
A. while
B. after
C. until
(答案→)D. when
解析：考查连词：A. while当…时候（表示时间段），然而，虽然，B. after在…后面C. until 直到，D. when当…时候，表示时间点，这时，句意：他刚到家，这时有人打电话给他。打电话是时间点，用when，这里when=at
That time。选D。