____________ 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
相关试题
He is wet to the skin. He ____ in the rain.
| A．must have caught | B．must have been caught | C．must catch | D．must be caught |
. Enough attention should be paid to _____ your pronunciation and intonation.
| A．improve | B．improving | C．improved | D．be improve |
Our country is now short of natural gas oil and other forms of_______.
A energy B strength C power D material
Knowing the result of the exam, he went home and lay in bed, ______.
A upset B 
was upset C felt upset D and upset
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