单项选择题

I_____ along the road when I saw Peter. So we stopped and had a chat. （） A. walked B. was walking C. would walk D. had walked

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多项选择题

果蔬采摘后采用以下哪些方法可以减少维生素的损失（） A. 科学的包装 B. 冷藏运输 C. 提高精制程度 D. 采用多次热烫处理

单项选择题

The teacher granted her the _____ to be in charge of Group One at the spring-outing (春游).
A.
ability B.
authority C.
certificate D.
authorities