---Where is my reference book? It was here a moment ago.
---Someone ______ it by mistake.
| A．should have taken | B．must take |
| C．might take | D．must have taken |
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---Where is my reference book? It was here a moment ago.
---Someone ______ it by mistake.
| A．should have taken | B．must take |
| C．might take | D．must have taken |
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