题文
If you buy ____ iphone 6 in our shopping mall, you will get ___ umbrella for free.
| A．a; an | B．an; an | C．an; a | D．a; a |
If you buy ____ iphone 6 in our shopping mall, you will get ___ umbrella for free.
| A．a; an | B．an; an | C．an; a | D．a; a |
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