to somebody, a British person often shakes hands with the stranger.
A. Introducing
B. To introduce
C. To be introduced
D. On being introduced
网友回答
A. Introducing
B. To introduce
C. To be introduced
(答案→)D. On being introduced
解析:很明显,句中的空白处应选用非谓语动词的被动形式。如果将C项填入空白处,虽然这个不定式是被动形式,但不定式短语处于句首时通常充当表目的的状语。而介词on后跟动名词时,其意为“一……就……”。如果介词on后带被动态的动名词,除上述意义外,还可表示“在……的时候”。选项D的这个意义正符合上面句子的句意。