He looks younger his friend; in fact, he is three years senior his friend.
A. to; to
B. than; by
C. than; than
D. than; to
网友回答
A. to; to
B. than; by
C. than; than
(答案→)D. than; to
解析：考查固定搭配。第一空前面有比较级younger的形式，所以后面使用than,第二空的senior要与介词to连用，senior to…比…年长；句意：他看上去比他的朋友要年轻，实际上他比他的朋友要年长3岁。故D正确。