If you don’t know how to spell a new word, you’d better ______.

A．look up a dictionary                          B．look up an dictionary

C．look it up in an dictionary                    D．look it up in a dictionary

If you don't know how to spell a new word, you'd better ________．

1. A.
   100k up a dictionary
2. B.
   100k up an dictionary．
3. C.
   100kitupin a dictionary
4. D.
   100kitupin an dictionary．

If you don’t know how to spell a new word, you’d better      ．

A．look up a dictionary                 B．look up an dictionary

C．look it up in a dictionary              D．look it up in an dictionary