单项选择Whenwemeetwithdifficultproblems,ourteacheralways

问题详情：

单项选择

When we meet with difficult problems, our teacher always ______ us to work them out by ourselves.

       A. makes  B. lets  C. has  D. encourages

【回答】

D

知识点：动词和动词短语

题型：选择题