试题详情

（ ）it is you’ve found, you must give it back to the person it belongs to.

If you refuse to do it,you must be ready to take the（ ）.

s（归属）that you must have to feel secure. But, in fact, the members of all the groups to which you bel

It is a must to check the relevant pump when metal chips are found.

___today. [本题2分] (　　) might do it (　　) must do it (　　) had to do it (　　) must have to do it解答参考：