关于英语的问题！急！

1 Smith's rarely read science fiction,_ _?(反问句）

2 —— i finish my homeworknow?

I'm afraid you ——.You'll have sth important to do.

A.Must,must B.May,must C.Must,mustn't D.May,mustn't

3.It's—— of you to do such kind thing

A secret B. stupid C. frighyened D. unable

4How long has he —— the new MP3?

A . bought B . kept C borrowed D had

1. did she? rarely是否定词，因此疑问部分用肯定形式。

2. A。表示“必须”，只能用must

3. B。由于不定式的逻辑主语由of引导，因此表语形容词必须是表示人的特征或性格的单词。

4. D。用于含有表示一段时间状语的完成时态中的动词必须是延续性动词。

1. hasn't she

2.B

3.B

4.D