Shallwe     thesinging?That’sagoodidea.Let’s     t...

问题详情：

      Shall we      the singing? That’s a good idea. Let’s      them.

   A. join; join in             B. join in; join         C. join in; join in         D. join; join

【回答】

B

知识点：动词和动词短语

题型：选择题