_______ from other continents for millions of years, Australia has many plants and animals not found in any other country in the world.
| A．Being separated | B．Having separated |
| C．Having been separated | D．To be separated |
To improve the quality of our products, we asked for suggestions _____ had used the products.
| A．who | B．whoever |
| C．whichever | D．which |
, I can’t express myself in words.
| A．So long as I am fond of her |
| B．Unless I am fond of her |
| C．Much as I am fond of her |
| D．As I am fond of her very much |
When asked to explain ____ made her remain so young , she began to tell us her secret.
| A．what it was that | B．that what was it |
| C．it was what that | D．what was it that |
He owes his success ___ the policy that poor children like him have equal access ___ good education.
| A．to; by | B．in; with | C．at; to | D．to; to |
The cruel mother abandoned her husband and son, ____ that she would never live with a crippled child forever!
| A．announcing | B．announced |
| C．to announce | D．announce |