________ the convenience of digital payment, many senior citizens started to use smart phones.
A. |
To enjoy |
B. |
Enjoying |
C. |
To have enjoyed |
D. |
Enjoy |
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________ the convenience of digital payment, many senior citizens started to use smart phones.
A. |
To enjoy |
B. |
Enjoying |
C. |
To have enjoyed |
D. |
Enjoy |