Was it 8 o’clock you heard someone at the door? [ ] A． when; knocking B． when; k

Was it 8 o’clock ________ you heard someone ________ at the door?

when; knocking

when; knock

that; knocking

that; knock

试题答案

答案：A

句意为：你听到有人敲门时，是八点钟吗？it指时间，when引导的是时间状语从句。容易将此题误认为是强调句。可在8 o’clock前加at以验证，排除C、D两项，即when引导定语从句；有具体时间，所以应该是“听到某人(在此时)正在做某事”，感官动词后加宾语和现在分词作宾补。