题干
—Must I sing the song in Russian? —No, you _________. It's up to you.
A：mustn't
B：can't
C：don't
D：needn't
答案(点此获取答案解析）
D
—Must I sing the song in Russian? —No, you _________. It's up to you.
A：mustn't
B：can't
C：don't
D：needn't
