问题

The scientist has had a research weather for more than 30 years.
A:in
B:on
C:at
D:From;
B:on
C:at
D:From;
正确答案是:
同类题型
The film is ____and we will be_____in it.
When the teacher came in, he saw some boys _______behind Daniel, _______ the computer games.
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It rained a lot during their journey, so they have had a good time. [ ]