---Where are the books?

---Don't worry. They________here in no time.

A. have sent       B. will be sent      C. are sending        D. have been sent

--- But where are the books?

--- Don't worry. They ________ here in no time.

1. A.
   have sent
2. B.
   will be sent
3. C.
   are sending
4. D.
   have been sent

--- But where are the books?

--- Don't worry. They ________ here in no time.

[　　]