We can never expect____ bluer sky unless we create_____less polluted world.（）
| A． | a; a | B． | a; the |
| C． | the; a | D． | the; the |
相关试题
They seemed ______ each other for a long time.
| A．knowing | B．to know | C．having known | D．to have known |
This is Mr. Smith. _______ help I worked out many difficult problems.
| A．whose | B．with whom | C．who | D．with whose |
---I’d like to buy a new computer.
---Well, we have several models __________.
| A．to choose from | B．to choose |
| C．for choosing | D．for choice |
____
___ to take this advance course will certainly learn a lot of useful skills.
| A．Brave enough students | B．Enough brave students |
| C．Students brave enough | D．Students enough brave |
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