问题
选择题
—What's that in the tree?
—There must _ some birds _ _ in it. [ ]
A. are, sitting
B. be, sit
C. be, sitting
答案
C
搜题请搜索小程序“爱下问搜题”
—What's that in the tree?
—There must _ some birds _ _ in it. [ ]
A. are, sitting
B. be, sit
C. be, sitting
C