题目内容
Was it 8 o’clock ________ you heard someone ________ at the door?
[ ]
A.
when; knocking
B.
when; knock
C.
that; knocking
D.
that; knock
答案:A
解析:
解析:
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。
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