—What's that in the tree? —There must _ some birds _ _ in it. [ ]A. are, sittingB. be, sit C. b

题目简介

—What's that in the tree? —There must _ some birds _ _ in it. [ ]A. are, sittingB. be, sit C. b

题目详情

—What's that in the tree?              
—There must _         some birds  _     _ in it.                
[     ]
A. are, sitting      
B. be, sit        
C. be, sitting
题型:单选题难度:中档来源:同步题

答案

C

更多内容推荐