题文
I don’t know if I _______ free tomorrow. If I _______, I will go to the bookstore.
| A．am; am | B．will be; will be |
| C．will be; am | D．am; will be |
I don’t know if I _______ free tomorrow. If I _______, I will go to the bookstore.
| A．am; am | B．will be; will be |
| C．will be; am | D．am; will be |
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