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It was in 1969 __________ the American astronaut succeeded in landing on the moon.

A. that 　　　 B. which 　　　　　C. when 　　　　　 D. in which

It was in 1969 ___ the American astronaut succeeded in landing on the moon.
A that　B which　C in which 　 　 D when

Was it in 1969 _____ the American astronaut succeeded_____ landing on the moon?

A．when；on    B．that；on     C．when；in     D．that：in

. Was it in 1969 _____ the American astronaut succeeded_____ landing on the moon?

A．when；on    B．that；on     C．when；in     D．that：in