题干
Did you _______ Gary _______ in his bedroom when you walked past last night?
A：heard; singing
B：heard; sang
C：hear; singing
D：hear; to sing
答案(点此获取答案解析）
C
Did you _______ Gary _______ in his bedroom when you walked past last night?
A：heard; singing
B：heard; sang
C：hear; singing
D：hear; to sing
