Question

3. It was not until he got home      he remembered leaving the door key where he had played basketball with his classmates.

Answer 1

3. that強(qiáng)調(diào)句中被強(qiáng)調(diào)的部分是milil引導(dǎo)的時間狀語從句。當(dāng)until部分被強(qiáng)調(diào)時，主句中的否定詞not要移到until前，形式為"It is/was not until - +that從句"。