—Where ____ Margaret have put the empty bottles?

         —She ______ them away. They must be somewhere.

         A．can; can’t have thrown     B．must; needn’t

         C．must; must have thrown  D．can; must throw

—Where ____ Margaret have put the empty bottles?

—She ______ them away. They must be somewhere.

A．can; can’t have thrown                                B．must; needn’t

C．must; must have thrown                              D．can; must throw

—Where ____ Margaret have put the empty bottles?

       —She ______ them away. They must be somewhere.

       A．can; can’t have thrown    B．must; needn’t

       C．must; must have thrown  D．can; must throw

—Where ____ Margaret have put the empty bottles?

         —She ______ them away. They must be somewhere.

         A．can; can’t have thrown     B．must; needn’t

         C．must; must have thrown  D．can; must throw

---Where ______ Margaret have put the empty bottles?

---She ______ them away. They must be somewhere.

1. A.
   can; can’t have thrown
2. B.
   must; needn’t
3. C.
   must; must have thrown
4. D.
   can; must throw