If there ______ no water or air on the earth, all living things would die.
| A．is | B．were | C．are | D．will be |
相关试题
While s
hopping, people sometimes can't help _______ into buying something they don't really need.
| A．to persuade | B．persuading | C．being persuaded | D．be persuaded |
With no one to ______ in such a frightening situation, she felt very helpless.
| A．turn on | B．turn off | C．turn around | D．turn to |
_______ 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 |
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