When taking an examination, we are usually not allowed to __________ dictionaries for the words we don't understand.
| A．look up | B．look for |
| C．pick out | D．refer to |
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When taking an examination, we are usually not allowed to __________ dictionaries for the words we don't understand.
| A．look up | B．look for |
| C．pick out | D．refer to |
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