求分析—Do you have any idea when the experiment was carried out
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 _____ their plan was approved.
A.that B.when C.before D.once
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你能帮帮他们吗