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

問題詳情：

      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

知識點：動詞和動詞短語

題型：選擇題