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问题 选择题

I was about to leave the office      an unexpected visitors came.

A．while

B．as

C．when

D．before

答案

答案：C

句型转换

句型转换。

1. The children are playing in the park. (单数句型)

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2. The birds are singing in the trees. (一般疑问句)

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3. I will go to the park. (用be going to句型改写)

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4. The girls are going to have a picnic in the park. (对划线部分提问)

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5. We're going to go to school at eight o'clock. (对划线部分提问)

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6. These dogs are very noisy. (否定句)

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单项选择题

第二喂入罗拉在工艺作用中也可称（）。

A、拉伸辊

B、定形辊

C、喂入辊

D、喂出辊
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