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

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：考查强调句和介词：第一空填that是强调句的一般疑问句，结构是：Was/Is it +强调部分+that（指人也可以是who），这句话强调的是时间状语，第二空填介词succeed in doing成功的做…，句意：是在1969年美国人成功的登陆月球的吗？选D。