—I expected him to be nervous before his speech, but he was as cool as a cucumber.
—He _______ it carefully.

—I expected him to be nervous before his speech, but he was as cool as a cucumber.

—He _______ it carefully.

A．could have prepared                    B．shouldn’t have prepared

C．must have prepared                     D．can’t have prepared

—I expected him to be nervous before his speech, but he was as cool as a cucumber.
—He _______ it carefully.

1. A.
   could have prepared
2. B.
   shouldn’t have prepared
3. C.
   must have prepared
4. D.
   can’t have prepared

 —I expected him to be nervous before his speech, but he was as cool as a cucumber.

    —He _______ it carefully.

A. could have prepared      B. shouldn’t have prepared

   C. must have prepared           D. can’t have prepared