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题型：单选题题类：模拟题难易度：容易

—How was the Third World Intelligence Congress in Tianjin, Bella?

—Wonderful! It was the first time I ______ such intelligent robots.

A . has seen B . has been seen C . had seen D . had been seen

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组卷次数：114次 +选题

举一反三

Minister Bill De Blasio ______ in office fewer than 48 hours when he came face to face with his biggest challenge in his life .

The monitor suggested to the Sea World in the summer vacation.

晚上别喝太多的咖啡，会睡不着觉的。（or）

When I entered the step-classroom(阶梯教室), the lecture _________ and the people _________ attentively.

He was about to tell me the secret _______ someone patted me on the shoulder.

In the 1980s in this village, there were only muddy roads to the outside, and concrete ones _____yet.

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