问题
选择题
I heard him ________ every night. [ ]
A. was singing
B. sing
C. sings
D. sang
答案
答案：B
搜题请搜索小程序“爱下问搜题”
I heard him ________ every night. [ ]
A. was singing
B. sing
C. sings
D. sang
答案：B