Question

—When I meet a new word, I have to ________ in a dictionary.

—Why not guess a word's meaning? It helps to read faster.

A.look up it B.look it up C.look up them D.look them up

Answer

B

【解析】

句意：—当我遇到生词时，我只好在词典里查找。—为什么不猜测词义？那有助于读的更快。

考查动词短语用法。look up it意为查找单词，代词it作宾语不能放在up后面，错误；look it up查找它，代词it作宾语放在up前面，正确； look up them代词them的位置不对；look them up查找它们，根据第一句的一个生词，代词不应该用复数。故选B。