It was not until this year scientists managed to make a cat and a goldfish disappear from sight using an invisibility cloak(斗篷)
A. that
B. when
C. while
D. As
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(答案→)A. that
B. when
C. while
D. As
解析：考查强调句型。It is/was... that是强调句型，可以强调除谓语外的任何成分，去掉it is和that后，不影响句意。句意：直到今年，科学家使用一个隐身的斗篷，才成功使一只猫和一条金鱼消失眼前。本题强调的是not until时间状语。故选A。