2.22．When the old man to walk back to his house ,the sun itself behind the
(A)．started ;had already hidden
(B)．had started ;had already hidden
(C)．had started ;was hiding
(D)．was starting; hid
5.25．—Would you mind my coming over and having a look at your new garden ?My little son’s curious about those roses you grow.
— .You’re welcome.
(A)．Yes ,I do
(D)．Not at all
6.26． from other continents for millions of years ,Australia has many plants and animals not found in any other country in the world.
(C)．Having been separated
(D)．To be separated