Was it in 1969 the American astronaut succeeded landing on the moon?A. when; onB. that; o

问题补充：

Was it in 1969 the American astronaut succeeded landing on the moon?

A. when; on

B. that; on

C. when; in

D. that; in

答案：

A. when; on

B. that; on

C. when; in

(答案→)D. that; in

解析：考查强调句及介词。前一空考查强调句it was … that …；succeed in doing成功做某事，故选D。