Experiments of this kind had in both the U.S.and Europe well before the Second World War 能不能详细讲讲?

Experiments of this kind had in both the U.S.and Europe well before the Second World War 能不能详细讲讲?
Experiments of this kind had in both the U.S.and Europe well before the Second World War
能不能详细讲讲?

Experiments of this kind had in both the U.S.and Europe well before the Second World War 能不能详细讲讲?
你这句话差个动词,在had后,in之前.