not until 与it is not until

not until 与it is not until

题目
not until 与it is not until
—table tennis was accepted as a regular part of the oliypic Games.
A.Not until 1986 B.It was in 1986 when CIt was not until 1986 that
D.It was until 1986
A 和B 答案有什么不一样·
答案
a是直到1986
b是当1986
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