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(22)__

• A、At

• B、Before

• C、After

• D、Since

(57)___

45.Why does the car rental company ask for the credit card number?

• A、To prevent the overuse of the car.

• B、To make sure that the car won't be damaged.

• C、To make sure the user return the car and pay for using it.

• D、To ensure that the car is safely and timely returned.