写出下列动词的过去式。1. do _______2. is _______3.

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问题填空题

写出下列动词的过去式。

1. do     _______
2. is       _______
3. have   _______
4. study _______
5. stay   _______

6. look   _______
7. come   _______
8. go       _______
9. live      _______
10. clean _______

答案

1. did 2. was 3. had 4. studied 5. stayed

6. looked 7. came 8. went 9. lived 10. cleaned

单项选择题

既补脾肺之气，又益肺肾之阴，并能固涩肾精的药物是：

A．山药

B．白扁豆

C．人参

D．白术

E．太子参

问答题简答题

单元工程施工质量验收评定应具备哪些条件？