问题
选择题
When I worked as the general manager of the firm, I sometimes had _____ to visit London on business.
A．opportunity
B．possibility
C．occasion
D．chance
答案
答案：C
occasion 作可数名词时，意为“时机”，作不可数名词时，意为“必要”，本题中occasion意为“必要”。从句语法结构上看，本句中用opportunity(难得的)机会，chance（偶然的）机会均可，但按逻辑意思，应用occasion.