IF YOU DON'T KNOW THE MEANING OF THIS WORD, TRY TO LOOK IT _______...

99. - E 10 BAI TAP TRAC NGHIEM GIOI TU
E 10 BAI TAP TRAC NGHIEM GIOI TU

99. If you don't know the meaning of this word, try to look it _________ in the dictionary.

A. out B. after C. up D. at