Whenyoudon’tknowsomewordsinreading,itisnotagoodidea    ...

問題詳情：

When you don’t know some words in reading, it is not a good idea             in a dictionary at once.

 A. look up them     B. looking up them  

C. to look them up   D. look them up

【回答】

C

知識點：動詞和動詞短語

題型：選擇題