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It was in 1969 ___ the American astronauts first succeeded in landing on the moon.
A.thatB.whenC.whichD.in which
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。
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