Question

9.  —Do you know the meanings of these new words?

―Sorry, I don't Let's____________ in the dictionary.

A. look after them        B. look up them

C. look them after        D. look them up

Answer 1

9.    D考查短语的用法。look up表示"（在词典中）査找"，代词作宾语时，须放在中间。故选D。