问题
选择题
Birds' singing is sometimes a warning to other birds ________ away.[ ]
A. to stay
B. staying
C. stayed
D. stay
答案
答案：A
搜题请搜索小程序“爱下问搜题”
Birds' singing is sometimes a warning to other birds ________ away.[ ]
A. to stay
B. staying
C. stayed
D. stay
答案：A