问题：
San Diego’s Zoo and Sea World are places where residents and visitors alike can enjoy r animals and plants in shows and exhibits, __ _ in part by San Diego’s climate.
A．made it possible
B．making it possible
C．making possible
D．made possible
San Diego’s Zoo and Sea World are places where residents and visitors alike can enjoy r animals and plants in shows and exhibits, __ _ in part by San Diego’s climate.
| A．made it possible | B．making it possible |
| C．making possible | D．made possible |
参考答案：