题文
Taxi booking apps_______ available for more than a year in some cities in Henan province since 2013.
| A．are | B．were |
| C．will be | D．have been |
Taxi booking apps_______ available for more than a year in some cities in Henan province since 2013.
| A．are | B．were |
| C．will be | D．have been |
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