—Is it for two months ______ they have stayed here?

    —No,it is only three weeks ______they arrived here．

    A．that;since     B．that;when      C．when;that      D．since;before

—Is it for two months ______ they have stayed here?

—No,it is only three weeks ______they arrived here.

A.that;since　　　　 B.that;when　　　　 C.when;that　　　　 D.since;before

-Is it for two months ________ they have stayed here?-No, it is only three weeks ________ they arrived here．

1. A.
   that,since
2. B.
   that, when
3. C.
   when,that
4. D.
   since, before

—Is it for two months ______ they have stayed here?

       —No,it is only three weeks ______they arrived here．

       A．that;since  B．that;when  C．when;that  D．since;before