This is _______ usual way of solving the problem. Can you think of ________ unusual way?
| A．a; a | B．a; an | C．an; an | D．an; a |
This is _______ usual way of solving the problem. Can you think of ________ unusual way?
| A．a; a | B．a; an | C．an; an | D．an; a |
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