It was in 1969 ___ the American astronauts first succeeded in landing on the moon.
A．thatB．whenC．whichD．in which
A
考查強調(diào)句型。It is... that是強調(diào)句型，可以強調(diào)除謂語外的任何成分；去掉不影響句意。句意“美國宇航員成功登陸月球是在1969年。”本句強調(diào)的是時間狀語in 1969。故選A。
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