—Has Sam finished his report?
—I have no idea. He _______ it in his office the whole morning.
| A．writes | B．has written |
| C．will write | D．was writing |
—Has Sam finished his report?
—I have no idea. He _______ it in his office the whole morning.
| A．writes | B．has written |
| C．will write | D．was writing |
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