—Will there be more tall buildings in 50 years?—________.
| A．No，there isn't | B．No，they aren't |
| C．No，there won't | D．No，they won't |
—Will there be more tall buildings in 50 years?—________.
| A．No，there isn't | B．No，they aren't |
| C．No，there won't | D．No，they won't |
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