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问题

Experiments of this kind ___in both the U.S and Europe well before the Second World War

A:had conducted
B:have conducted
C:have been conducted
D:had been conducted
正确答案是:
同类题型

did you go yesterday morning—1 went to our school library to read books on physics.

townto the shopping centre soonCould I get you something—No, thanksI will do e-shopping

did you think of theplace— I didn’t care for it at ____first, butafter ____ time I got to like it

For the Turner sisters and their classmates,taking a part­time job might ______ their time for study.

It seems as if she has forgotten all about her ambition nowshe made it hers to make a bit of progress every day when school started

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