如把"Once" 使用在句子上, 其意思是"一但", "一當" 之後的動詞是否都可以用現在式及 過去式 ? 如果可以, 是否在時間上有不同含意 ?
i.e. The sales sample will not drop and pls go ahead sampling once
the trial sample was approved.
i.e. The sales sample will not drop and pls go ahead sampling once
the trial sample is approve.
Which one is correct ? or both ?