______ to somebody,a British person often shake hands.A) On being introduced B) On introducingC) When introducing D) While introducing

______ to somebody,a British person often shake hands.A) On being introduced B) On introducingC) When introducing D) While introducing
______ to somebody,a British person often shake hands.
A) On being introduced
B) On introducing
C) When introducing
D) While introducing

______ to somebody,a British person often shake hands.A) On being introduced B) On introducingC) When introducing D) While introducing
选A
a British person 与介绍 为被动关系
整句话的意思是 当英国人被介绍给他人时,他们通常握手.