Question

It was in 1969 ___ the American astronauts first succeeded in landing on the moon

1. A.
   that
2. B.
   when
3. C.
   which
4. D.
   in which

Answer 1

A
考查强调句型。It is... that是强调句型，可以强调除谓语外的任何成分；去掉不影响句意。句意“美国宇航员成功登陆月球是在1969年。”本句强调的是时间状语in 1969。故选A。