—Where ________ Mary have put the empty bottles?
—She ________ them away. They must be somewhere.
| A．can; can't have thrown |
| B．must; needn't |
| C．must; must have thrown |
| D．can; mustn't have thrown |
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—Where ________ Mary have put the empty bottles?
—She ________ them away. They must be somewhere.
| A．can; can't have thrown |
| B．must; needn't |
| C．must; must have thrown |
| D．can; mustn't have thrown |
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