问题
选择题
Listen! They ______ in the next room.[ ]
A. sing
B. is singing
C. are singing
D. were singing
答案
答案：C
搜题请搜索小程序“爱下问搜题”
Listen! They ______ in the next room.[ ]
A. sing
B. is singing
C. are singing
D. were singing
答案：C