It was not until the subprime loan crisi

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问题选择题

It was not until the subprime loan crisis（次贷危机） ____ great damage to the American financial system that Americans ____ the severity of the situation．

A．caused, realized

B．had caused, realized

C．caused, had realized

D．was causing, had realized

答案

答案：B

考查时态。not until引导的状语从句，从句用过去完成时，主句用一般过去时，故选B。

句型转换

1. They are American lions. (改为单数句子)

______ ______ ______ American lion.

2. The wolf eats vegetables and fruit. (改为否定句)

The wolf ______ ______ vegetables ______ fruit.

3. There're some elephants from Africa and India. (改为同义句)

Some elephants ______ ______ Africa and India.

4. The giraffe lives in the grassland. (改为一般疑问句并作肯定回答)

______ the giraffe ______ in the grassland?

Yes, ______ ______ .

5. around, do,come, they, from, all, world, the(? ) (连词成句)

_____________________________________________________

填空题

周长是384米的正方形花坛，它的面积是______平方米．