People have lots of problems living in the central Australian desert, ____ the lack of water is the most serious one.
| A．of which | B．which | C．for which | D．where |
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.I wish I________a chance to talk with you about my writing before you left yesterday.
| A．have | B．had | C．had had | D．will have |
Not only_______polluted but________crowded.
| A．was the city,were the streets | B．the city was,were the streets |
| C．was the city,the streets were | D．the city was,the streets were |
I like_____ in the autumn when the weather is clear and bright.
| A．this | B．that | C．it | D．one |
1.He is talking so much about America as if he________ there .
| A．had been | B．has been | C．was | D．has gone |
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