求分析—Do you have any idea when the experiment was carried out?—I hear it was not until last year _____ their plan was approved.A.that B.when C.before D.once

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求分析—Do you have any idea when the experiment was carried out?—I hear it was not until last year _____ their plan was approved.A.that B.when C.before D.once
求分析
—Do you have any idea when the experiment was carried out?
—I hear it was not until last year _____ their plan was approved.
A.that B.when C.before D.once

求分析—Do you have any idea when the experiment was carried out?—I hear it was not until last year _____ their plan was approved.A.that B.when C.before D.once
—Do you have any idea when the experiment was carried out?
-- I hear it was not until last year ___when__ their plan was approved.
==it was not until last year WHEN _ their plan was approved THAT the experiment was carried out
===the experiment was carried out LAST YEAR when__ their plan was approved.

选择A；
It was ```that 为强调句型

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